After heading back to the tram save and go to mission 2. It will unlock then.

After heading back to the tram, save and go to mission 3. It will unlock then.

After heading back to the tram, save and go to mission 4. It will unlock then.

After heading back to the tram, save and go to mission 5. It will unlock then.

After heading back to the tram, save and go to mission 6. It will unlock then.

After heading back to the tram, save and go to mission 7. It will unlock then.

After heading back to the tram, save and go to mission 8. It will unlock then.

After heading back to the tram, save and go to mission 9. It will unlock then.

After heading back to the tram, save and go to mission 10. It will unlock then.

After heading back to the tram, save and go to mission 11. It will unlock then.

Get on the ship and you'll be awarded the achievement after the cutscene.

Head back to the ship after the battle and you'll be awarded with the achievement after the cutscene triggers.

Beat the game on any difficulty and you will unlock 'impossible' mode. You must beat it on impossible to receive this achievement. Like the name implies it is very hard. Always make use of every possible item you find. If you can't carry anymore, head back to the bank to make a spot for it, do not waste med packs. Sell air canisters, upgrade only what you need i.e. suit HP, air, and the only gun you use. Save as often as possible. Conserve as much ammo as possible - try shooting out the legs and crushing their heads with your foot to save ammo. Use Stasis and the Stasis cheat, unless you don't want to cheat. It's up to you. It does not effect achievements - cheats are in the FAQ.

Note: You will unlock impossible mode if you beat easy, as soon as you start the game on impossible, save it otherwise it will disappear and you will need to beat the game on another difficulty to unlock it again.

Beat the game on any difficulty and bam it unlocks.

If your playing on easy, put everything in the bank except for ammo for one gun you like, and one or two med packs. Keep finding anything you can and then go to the store and move each item from your inventory to the bank. Keep doing this throughout the playthrough and you'll get it in no time.

See "Legend Teller."

At first I thought I was going to have a huge problem with this and have to go and find every one of them, but I actually got both achievements just going through the game once. You will come across text messages, audio logs, and video messages, just keep looking in every room and as you walk; you will come across many of them. You can miss 18 throughout the entire game meaning you do not need every single one, so don't fret if you miss one or two. There are 168 in total. You will also get a log for each time somebody talks to you and tells you what to do.

Look for all the credit points you can find. Sell semiconductors and save up your money for each gun. You will need 55,000 credits for all the guns.

On level 10 you will come to a mini-game on a Zero G Basketball court. You must beat the high score or tie it to move on to the next level. All I did was start the game, jump to the very front wooden platform, shoot 20 goals at level 1, wait, at level 2 shoot 21 and wait, level 3 shoot 22, wait, level 4 shoot 23, and so on until level 6. Complete that level and you will unlock this achievement. Don't bother getting multipliers.

Sometimes these objects will have a dark blue glow around them. Schematics are like blueprints for armor and weapons, and they allow you to buy them at the store or upgrade your suit. There is a schematic for 6 levels of suits and 6 guns. You should get this early in the game.

This is very easy to do. Find a small object and hold and press to grab it with Kinesis and then press the to shoot it. Repeat 50 times.

See "Butcher."

See "Butcher."

Shoot for the head, arms or legs of aliens, after they're dead run to their body and press and stomp off every limb until you just have the body left. Head, arms, and legs can come off. You can do this on normal dead bodies too. Rinse and repeat on anything and everything you down or come across.

Every time you see an enemy hold , aim at it and press . It will slow it down, then just kill it, find another, do the same thing. Make sure to keep your Stasis gauge full, note, it will drain very fast when using it a lot. Use cheats to keep it filled if you like. They do not affect any achievements.

You will come across the Shooting Gallery in level 9. Use the Plasma Cutter and have it on vertical firing mode. The goal here is to shoot all the red guys as fast as possible (if you miss a red guy, you lose) and without shooting a single blue guy. It takes a little bit of practice but it's pretty easy once you get the hang of it. You will get good prizes too, so it's worth doing for more than just the achievement.

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Zero G rooms will be marked and it will tell you when you're in one. Make sure you don't have an oxygen timer going as it'll make things ten times harder. Just keep jumping from wall-to-wall and you will get this. There are many spots to Zero G Jump throughout the game.

This can be done in a good 7-8 hour playthrough on easy. Make sure you upgrade the Plasma Cutter all the way. It will help a lot. Stock up on nothing but ammo for the Plasma Cutter and a few med packs. Sell everything else. If you run out of ammo in a boss fight, I hate to break it to you, you're screwed.

This one is pretty easy. Shoot out the legs of an alien and when it starts walking with its arms, run up to it and press and you will obliterate it with your boot and it will die. Do this 29 more times and you'll unlock the achievement.

This achievement is a pain. Always look for blue and yellow cases on the wall, each one has a power node guaranteed. Do not sell your weapons, you will lose all upgrades you bought for them if you do - I had to find that out the hard way after wasting 35 nodes on them. You will need to do multiple playthroughs on the same save. You can buy power nodes at the store for 10,000 credits each too, so be sure to save up your money. Concentrate on stuff you need first then move on to weapons you don't use after. When you want to upgrade, go up to a work bench and press , then select what you want to upgrade and start popping in power nodes for each upgrade slot. 155 Power nodes are needed in total. You do not have to waste them on the empty slots. Try and go around them.

During chapter 4 you will come to a room with many panels that are missing, they have blue lines coming from them. Do not step on them as it will instantly kill you. You need to get monsters on them and kill them with it, and you will get the achievement. To do this have your Stasis gauge full, hit them with Stasis and then push them by walking into them with your body until they fly up and die. Make sure you don't go with them otherwise you die. You should have just enough enemies, if you do happen to run out and still don't have the achievement, there will be a few more panels on chapter 9.

This achievement is cumulative, which means you do not have to save up to 300,000 credits and spend it all at once. You can keep spending money with whatever amount you have and when it adds up to 300,000 it will unlock.

If you're going through on easy, all of the weapon achievements are very simple. Most enemies die in one hit. With this gun you need to press and hold to charge it up and then let it go. Enemies get obliterated by it. Make sure to stock up on ammo for each gun, then once you get it, store the gun in your safe and buy ammo for the next gun. Repeat for every gun achievement.

A very fun gun, which shoots a spinning saw blade out that you can control and chop up limbs with. Stock up on saw blades for this as and when you can.

This is your starting weapon, surprisingly one of the best in the game. Depending on how many guns you're carrying, if you're just carrying one gun you will get a lot of ammo for that gun. Make sure to make use of the  while holding the (alt firing modes) when needed.

Looks a lot like the Half Life Gravity Gun and works a lot like it too, but you can pick up objects with it. Works best up close.

The flamethrower will require a lot of ammo. You will burn through a canister of fuel for one guy. Aim for the arms or legs and make sure to keep plenty of fuel tanks for it.

Aim for the legs and arms. If you get surrounded by enemies press and hold and then hold   which means you will get on one knee and you will hold the gun up shooting all around you. It's the definition of awesome.

Aim for the shoulders and it should just about kill every small monster in 1 hit. Keep only one weapon in your weapon slots meaning you can hold lots of ammo.

You can find this on chapter 11, in between the two walkways. It's an award, probably an easter egg from the developer. Anyway, just grab it with Kinesis and pick it up. It can be sold at the store for 30,000 credits!

From Sgt Dex Grif: "Peng's Treasure is located directly to your right as you exit the ship on chapter 1. Unfortunately, it's also out of reach. When you come back here in chapter 11, you will have Kinesis to grab it with."

Picture of it: