Get a total of 50 Trap kills while playing the story mode in either of the two stories. To set a trap just walk up to a tree and press and and hold the RB button until the branch is fully set. Set the trap in a good spot, preferably near a lot of mercenaries and throw a rock nearby. Wait until you hear a snapping sound and that means you killed the merc.

Note: For this and all other single player achievements requiring 'X number of kills' of a certain time, the kills are cumulative across multiple plays through. If you beat the game on easy and then continue a new game on medium difficulty, the kills will carry over and add to your total.

Get a total of 100 headshots in any of the two story modes. I found this easiest done in the first story after finding a sniper rifle. After finding a sniper, enter in the cheat "UnleashHell" and have fun firing away at the mercs. Alternatively you can use any weapon, such as the pistols, just find something that you are comfortable with.

Get a total of 40 stealth kills in story mode. To get a stealth kill you must approach the merc from behind and press the B button and if done correctly you will stab him in the back.

Note: Must be done before you unlock your Feral kill ability as the two are different.

Accumulate a total of 80 feral punch kills in story mode. I found this easiest done in the first mission. You do not yet have feral punching abilities so you have to enter in the "FeralAttack" cheat and this ability will become unlocked. Just go throughout the level slashing anyone in your sight.

This is by far the hardest achievement of the game but if you follow this guide you will get this achievement while trying to complete the story on all levels of difficulty.

Click here to view the walkthrough on forums

Quickest way is to create your own game session, starting it with the lowest time set.

See 'Chaos Winner'.

Fastest done if you start your own game and set the needed captures to the lowest amount possible (1). After that begin the game and capture the needed amount of files to win.

See 'Chaos Winner'.

See 'Steal the Sample'.

Come in first place in every single game type and this achievement will be yours. Follow the steps explained in 'Multiplayer Champion" for faster results.

Easily done by creating your own game with an auto launch timer and the shortest possible time limit (1min) and leaving it on.

See 'Chaos Champion'.

Must capture the sample or it will be a draw so just create a small map in Map creator with the bases near each other and set the capture limit to the lowest amount possible. A smart map for this would be with the red and blue bases in line and the blue players spawn behind the red sample and the red players spawn behind the blue sample (make sure that the players are in a straight line) and just leave the game on with an auto-launch timer and with your controller so that your analog stick is forced upward. Make sure the players are all facing towards the base for this to work.

Here is a basic drawing of the map..by basic I mean basic.

The quickest way for this one is to make a small map in map creation and have a friend join your game. Start the game with you on whichever side you prefer and win.

Create a small map with the stations extremely close together and start the game alone with the lowest amount stations needed(3) and just capture them.

Start your own game lobby with an auto launch timer on either Team Chaos or Chaos and just leave your 360 on. Make the game as short as can be and make sure that your controller will not turn off while you are not there and just leave it.

Note: Check back now and then so you can switch the game types from Chaos to Team Chaos so as to get three achievements at once.

The online time is only counted if you are in a game. Create your own game with an auto-launch timer and leave your controller on for a total of 80 hours. Make sure that you do not make the time unlimited for it will never end, I suggest making the game 45 minutes long.

Do this with a group of friends and make a small map and have it so the desert eagle gun is on it and have them let you get headshots on them. Does not have to be all in the same game.

Between the headshot achievement and others, you will receive this achievement soon after the other multiplayer ones. Alternatively, if you are only trying for this achievement you can create a small map with the predator power-up everywhere and go crazy killing your friends/anyone that joins.

Have some friends join and have them run into traps a couple of times, or whichever way you prefer to kill them, but I believe traps are the most amusing.

Make a small map with the assault rifle gun with the grenade secondary fire. Only the grenades, the pipe bombs, and the secondary fire on the assault rifle count as explosive kills, Molotovs do NOT.

Create a small map that is a straight line and have walls encircling everything so people cannot run away and have one car on this map. Have some friends join and just keep going back and forth until you unlock this achievement.

Create a small map with predator power-ups everywhere and invite some friends to join and have some fun. Feral Punch whilst a predator by pressing the B button.

Create a small map with trees everywhere and tell your friends to run into the branches.

Story Tips-

-Use the cheats for an easier time completing the story modes.

-I advise you to complete the story first on rookie so as to get a feel for where everything is because on Predator difficulty there is not a map.

-Pay attention and get the samples as you play so you do not have to play any extra times.

Must be done on rookie difficulty.

Must be done on hunter difficulty.

Must be done on predator difficulty.

Evolution story mode is unlocked after you beat Instincts on any difficulty or if you use the cheat "GiveMeItAll"

Must be done on rookie.

Must be done on Hunter.

Must be done on Predator.

Complete all levels of difficulty for the Evolution story mode.

You will receive this after completing both the Instincts story and the Evolution story on any difficulty level.

Finish the Evolution story and the Instincts story on all difficulty levels.

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Cheat Codes

(Yes, cheat codes allow achievements to be unlocked.)

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Code: Bloodlust

Enter code: Cheat Menu

Effect: Infinite Feral Attack gauge

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Code: FeralAttack

Enter code: Cheat Menu

Effect: Feral Attack in early stages

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Code: ImJackCarver

Enter code: Cheat Menu

Effect: Restore Health

( this must be entered each time you are low on health )

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Code: GiveMeItAll

Enter code: Cheat Menu

Effect: Unlock the Evolution Story

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Code: GiveMeTheMaps

Enter code: Cheat Menu

Effect: Unlocks all Maps

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Code: UnleashHell

Enter code: Cheat Menu

Effect: Infinite Ammo