Gotta catch em all. Have fun!

See “Big Boss”

See “Big Boss”

See “Big Boss”

See “Big Boss”

This will be tough. You will need to complete all MAIN OPS and EXTRA OPS with an S rank. These can be obtained in both solo and co-op.

Missable

You will be given a mission to use the Fulton Recovery System. After this point forward you'll just need to recover POWs and enemies that are down but not out (stunned, sleeping, or near death). (Refer to Hold-Up Artist and Stun Specialist)

Missable

To perform a hold-up, approach an enemy (preferably from behind) and once in CQC range (indicated by the CQC hand) aim your weapon and DO NOT SHOOT. Your character will say "FREEZE!" (or Don't move, etc...).

Enemy will then lay down where you can use Fulton recovery, Stun Rod, Kill them, etc... (see Fulton Recovery Veteran, Lethal Enforcer, and Stun Specialist)

Simple, be it by gun, cliff drop, or explosives. Kill 100 soldiers.

Missable

Stun can be done via the Stun Rod or CQC. Rinse and repeat 100 times. And even though it has Zzzz on the picture, you want stars above their heads.

Collecting all suits will take your entire play through and then some.

Sneaking Suit - Main Op: Combat helicopter: Mi-24A
Battle suit - Main Op: first Peace Walker battle
Battle suit w/ Helmet - Randomly received when fighting SS rank matches in Outer Ops
J. Fatigue - receive from the beginning of the game
Leaf - complete extra Op 14 with S rank
Tiger Stripe - Main Op: pursuing Amanda, in Bananal Fruta De Oro: sorting shed (it's in the office in the north end)
Choco-chip - complete extra Op 45 with S rank
AUSCAM - Main Op: Barricade Destruction
Square - extra Op 30
Splitter - extra Op 29. If it doesn't appear there, it's in extra Op 59, on top of a box.
Snake - extra Op 16 (the concrete area where the lumber is stacked)
Neo Moss - extra Op 62 (use your codec to communicate with the ghosts until they say "The End")
Bad Smell - clear extra Op 61 with S rank.
Tigrex - clear extra Op 123 with S rank.
Liolaeus (rathalos) - clear extra Op 121 with S rank.
Gear Rex - clear extra Op 125 with S rank.
Black, Khaki, navy blue, White, Red, Yellow, Pink, etc. -(unlocked at start, DLC in the PSP version)
Naked - get this from the beginning
Naked (Leaf) - Outer Op
Naked (Tiger Stripe) - Main Op: pursuing Amanda
Naked (chocolate) - Outer Op
Naked (AUSCAM) - extra Op 30
Naked (splitter) - extra Op 29 or Outer Op
Naked (snake) - Main Op: tropical cloud fog forest
Naked (same as above with black, khaki, navy blue, red, etc)-(unlocked at the start, DLC on the PSP version)
already unlocked, originally DLC)
Tuxedo - Clear chapter 4
Swimming trunks - extra Op 67 (on the bridge after you clear the mission with S rank)
Bikini - extra Op 68 (on the bridge after you clear the mission with S rank)
Miller - clear extra Op 68 with S rank.
Amanda - clear extra Op 67 with S rank.
T-shirt – extra Op 1, 2nd floor.

For a detailed guide refer HERE.

Missable
Special staff includes Kojima and 3 POW with the voice actor skill.
-Kojima can be found in the truck. See "Hideo Kojima" achievement. Then beat the main story.
- Do the Travel to Mine Base, then fulton recover the POW on the roof. He is kinda hidden by the area you start at. On the roof there should be a ledge that you can hang down on and scale across.
-On Zadornov Mission 1 look for the POW on Banana Fruta de Oro. Fulton him.
-Finally on Zadornov Mission 5 look for the POW near the truck at the start of the mission. Fulton again.

Missable

Main Ops # 9 - Infiltrate the crater base. During the cut scene select the truck with the license plate "Centro America 63824 Peace sentinel".

If you play co-ops and the person who selects the truck already has it they WILL NOT see Hideo Kojima. But any player who doesn't have him will see the cut scene.

Missable

A mech is any Tank, APC, or Helicopter you have to fight.
Preferred method is to "try" avoid damaging the mech and take out the escort unit. After the escort units have been dealt with you can attack the mech until the Captain pops out. Take out the Captain and you'll receive the Mech which may be used during Outer Ops missions.

After Main Ops 33, do these:
-Extra Ops 112 through 117 all custom Mechs. While in the AI pod pulling boards press while switching rows when you see a ! pop up. Be quick, if you miss it, you will have to play again. Listen to them from Briefing Files>Data Files>Paz's Diary.

Missable

After you receive the letter from Huey to Dr Strangelove it will appear in the R&D section under other. Click on the letter and select to read it.

Missable

Replay any Main Op AI Battle (Pupa, Chrysalis, and Cocoon) after you beat the game.

When removing memory boards inside the AI be alert when moving from one column to another a with an "!" above it will appear. If you reacted in time you will stop half way between the columns and remove a memory board. After you remove the board you'll notice the one you selected will not have been removed.

Go into Mission selection and go to the database. The achievement will pop once you start listening to the 3rd audio tape.

Listen to the following conversations with Chico in the Briefing Files.
- After Main Ops Mission 5
(The Real Basilisco)
- After Main Ops Mission 8
(The Loch Ness Monster)
(Nahuelito)
(Mokele Mbembe)
(Ogopogo)
- After Main Ops Mission 10
(Big Foot)
(Mondo Grande)
- After Main Ops Mission 13
(Kongamato)
- After Main Ops Mission 15
(UFOs)
(Abductions)
(Elbakki)

After listening to the conversations from above, play the Extra Ops 29 or 35 as Snake. Go to the Coastal area and Trenya will appear on a boat near the bridge. Approach Trenya and trigger a cutscene and the mission will be completed. Once that is done, the Monster Hunter Extra Ops mission will now appear.

GUIDE AND WALK THROUGH BY TKHBECKER:
http://www.xbox360achievements.org/f...d.php?t=345350

Missable

You must perform 6 CQC throws in a row. If you remember during the prologue you did CQC combos. To perform a combo you must throw your first enemy with another nearby. As soon as you throw the first IF another enemy is close by you'll see a CQC indicator with 2 hands. Then 3. Then 4... up to 6.

This is (IMOO) one of the most pain in the arse achievements to accomplish. I myself did not receive this until way after I completed the game and was playing Co-Op thru the main mission with a friend during the pre-Cocoon battle.
A friend was able to do this with 3 enemies and myself with 6.

Missable

A tribute to The Assassin's Creed franchise.
Obtained during Main Ops # 16 - Travel to the Mine Base.
I would suggest taking out all guards prior to attempting to acquire this item. Climb the boxes next to the southernmost building closest to the exit. Do a double tap roll to the near building. Walk towards the east. At the apex of the roof an edge you will see the iconic pigeon poop. Make sure to have an empty item's slot. If not drop unimportant items. Approach the poop in the upright position and press the action button when prompted. You will do the slow motion swan dive into the box.

You'll get the Love Box in the first mission on Bosque del Alba after the tutorial on the beach. It's in the back left corner. It just feels so right.

Missable

Various levels have red "explosive" barrels and trucks in them. Simply shoot the barrel or truck resulting in an explosion with an enemy nearby killing him.

ALT

Optional Ops #56- One Shot. During this op you have to eliminate all enemies with an M16 with... you guessed it... one shot. There are 2 Kidnappers and 3 soldiers. You have to shoot one of 3 explosive barrels to kill all enemies. If you fail the op you'll still receive the achievement.

Missable

Once Outer Ops is unlocked a few missions into the story, simply deploy a team and wait for there return.

pgrooveparry's tip:
First build up your Heroism points. Doing Insignia challenges is probably the fastest way to get a big boost. If you want to grind these, you can to the extra op "Banana Hold Up" mission. It gives you about 270 heroism and can be completed in under 1 minute.

The more Heroism points you have the better chance you can recruit S rank soldier via Scanning. Once you've scanned and recruited a team of S rank soldiers, send 'em out in Outer Ops and that should be it.

I believe if your soldiers come back dead, you can dashboard out, reboot and it will generate a different outcome. I heard about this, but never tried it since I didn't need to.

Missable

As you play thru Main Ops you will unlock the Trade option. You must have at least 1 person in your Trade Waiting Room prior to selecting the option. Easiest done with a friend. But can be done randomly.

Also you may be able to find help here at Official Peacwalker Friend Finder by MC Kazoo

Missable

As you play thru Main Ops you will unlock the Delivery option. Easiest done after playing a Co-op mission.

Simply go to Delivery and create a new gift.
Address: Shows gamertags of people you've played recently or Free.
Date: When you want package delivered.
Music: Several options.
Item: Items or Ammo
Send.

First, wear the tuxedo then equip these comms:

It's not over yet!
Don't die on me.
You're pretty good.
I'm with ya.

Good luck.
Good!
You can do this.
Thanks.

Good to have you!
Good work.
Impressive.
Nice one!

Kept you waiting, huh?
I like it!
Peace!
Not bad!

Repeat each of them twice and then break out the Love Box. Simple as that.

Same Co-Ops commands as the Paz date, but wear swim trunks instead of the Tux. When you get the affinity high enough, use the Love Box.

GUIDE BY TKHBECKER FOR PAZ AND KAZ:
http://www.xbox360achievements.org/f...d.php?t=344209

Missable

A tribute to Monster Hunter game franchise.
Any Optional Ops Monster Hunting Quest. Simply have a ration equipped as the default item. Approach the BBQ pit and press action, , button. Character will sit down and start to cook the ration. Watch the ration until it starts to turn to a medium brown and press action, , button. If done right you'll get the achievement and a W.D. Ration

Find a friend and start up VS. Ops. There are four different game types. Deathmatch, Team Deathmatch, Capture Mission, and Base Mission. Play one whole round of each using default settings and its yours.

Find Friends with my Friend Finder!
http://www.xbox360achievements.org/f...d.php?t=339358

This is done with the Tanegashima Musket aka the Tornado Gun. This can be unlocked by S Ranking Extra Ops 121 or 122 to obtain the Rathalos Wing. For this mission, MK22 (Lvl. 3) the blue Velociprey. DO NOT KILL THEM! As for Rathalos, use a machine gun when its on the ground and the FIM missle launcher while in air. Deplete its health and aim for blowing off body parts(head, wings, and tail). After that, hit it with the MK22. Sooner or later, it will pass out. Do it as quick as possible and no kills and you should be fine. Also, apparently the night version, Extra Ops. 122, has a higher chance of a drop.

Alternatively, if you have a friend who owns the musket all you have to do is play co-op with them and "reach into their pocket" to use the musket. If you select your weapons screen, you can switch to see what's in your partner's weapon screen if you're close enuogh and actually use their weapon.