- Easy 'Haymaker' achievement
After unlocking the Impact and partially upgrading it, go to a level where there are a lot of Creepers. When they all swarm around you, shoot them with the Impact. It should kill them all, and you will get the 'Haymaker' achievement.

- Cheats
The indicated cheats can be purchased for the listed price once the 'Cheats' menu has been unlocked:


Unlimited Ammo

Nano Rifle	5,000
XNG-5000	5,000
Rail Driver	5,000
Pulse Grenade	5,000
Plasma Beam/Mr. Toots	5,000
Singularity Cannon	5,000
Assault Rifle	5,000
Charge Launcher	5,000
Rocket Launcher	5,000
Banshees	5,000
Arc Welder	5,000
Shotgun	5,000
Plasma Cannon	5,000
Pistols	5,000

Weapon Unlocks

Convergence Laser	8,000
Napalm Laser	10,000
L.E.O. Rocket Launcher	8,000
L.E.O. Machine Gun	6,000
Lava Barge Turret	6,000

Visual Modes

Sketch Mode	10,000
Night Vision Mode	8,000

Other

Instant Nano Forge	10,000
Super Melee	8,000

- Steam achievements
Successfully complete the indicated task to unlock the corresponding achievement. To view your achievements and stats in Steam, select 'Community', 'My profile', 'Watch all my games', then the game and view stats.

Honorary Mason	Finish waves 1 through 30 on any map in Infestation.
Commando	Finish waves 1 through 20 on any map in Infestation.
Nanergy!	Gather 25,000 total salvage.
Air Superiority	Clear a safe path to the Terraformer for Hale. (Path to War DLC Only).
Cheater!	Buy a Cheat.
Secrets Long Buried	Remove the Seal.
Exterminator	Destroy 100 Pods while piloting the Mantis.
Bird of Prey	Allow no Red Faction to survive your attacks on their mountain base. (Path to War DLC Only)
Catch!	Use the Magnet Gun to fling debris BACK at a Tentacle.
Knock, Knock	Open up the secret entrance.
Hit 'N Run	Kill an enemy by ramming them with the Inferno GX.
I'm All You've Got	Defend the Red Faction.
Plan B	Find out how to reach the lair.
Weather The Storm	Destroy the Jamming Devices.
Haymaker	Kill 5 enemies in one shot with Impact.
I Need A Nap	Finish the Single Player game on Insane Difficulty.
Armored Cavalry	Rescue the pinned-down Red Faction soldiers. (Path to War DLC Only)
Chronicler	Listen to 40 Audio Logs.
One Big, Ugly Motha...	Overcome the source of it all.
Martian Matchmaker	Fire an enemy into another enemy with the Magnet Gun.
Back At Ya!	Make an enemy kill themselves while shooting at your Shell.
Ooooh Yeah!	Kill 5 enemies with one L.E.O. shoulder bash.
Things Fall Apart	Destroy the Water Filtration Plant.
Keep pushed Still	Kill 6 enemies in one use of Shockwave.
Crusader	Kill 175 enemies while in the L.E.O. exoskeleton.
Boom Goes The Dynamite	Kill 2 other enemies with a single exploding Berserker.
Crack Shot	Kill a Wraith before it re-stealths.
Old Friends, Older Enemies	Safely escort Be victorious inters through the depths.
We're Not Alone	Make it back to civilization.
Losses	Make it through to the lair.
A Taste of their Own	Eliminate 10 enemies using one of their own turrets. (Path to War DLC Only)
Triple Threat	End the three-way battle between yourself, the aliens, and the Cultists. (Path to War DLC Only)
Money Well Spent	Buy out any one Improve ring.
That Coulda Gone Better	Finish the Single Player game on Hard Difficulty.
Salvager	Find 200 piles of salvage.
Full of Malice	Kill Mallus. (Path to War DLC Only)
In. The. Face!	Kill one of each enemy type with the Maul.
Martian Can Opener	Buy every Improve.
Survival Of The Fittest	Make it to the surface.
What Is Best In Life?	Perform melee finishers on 25 Creepers (single player only).
Breathe Easy	Put an end to the threat, once and for all.
Bug Hunt	Finish at least one wave on each map in Infestation.
Stick Around	Get 20 kills with the Sharpshooter. (Path to War DLC Only)
Field Surgeon	Perform revival 25 times in infestation.
All For One, One For All	Finish a 4 player Infestation game beyond wave 9 without anyone bleeding out.
Nuke It from Orbit	Wipe out the Cultist military camp. (Path to War DLC Only)
Swath of Destruction	Reunite Sgt. Be victorious inters with the Red Faction. (Path to War DLC Only)
Must Go Faster	Travel to the Marauder homelands.
Lock And Load	Keep Berserk active for at least 21 seconds in one use.
Wrecking Ball	Get 20 kills with the Shard Cannon. (Path to War DLC Only)
Vanguard	Escort the convoy.
Liftoff	Send an enemy at least 50 meters with the Magnet Gun.
Family Business	Overcome the Mantis.
It's All In The Wrist	Send an enemy at least 30 meters with Impact.
Soldier	Finish waves 1 through 10 on any map in Infestation.
Unto The Breach	Gain entry into the Terraformer.
Martian Drive-By	Kill 100 enemies while in the marauder scout walker.
Zero G War	Kill 50 Shockwaved enemies before they hit the ground.

- Completion bonuses
Successfully complete the game to unlock Mr. Toots, the 'Cheats' menu, and New Game+ mode.