Here is the full list of all 49 Alien Rage - Unlimited achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Defeat Mk XII Heavy Mech
Defeat Vorus Gladiator
Reach a player score of 25,000,000
Survive the Heavy room
Defeat Security Turrets
Take out the bunker
Defeat Vorus Centurion
Unlock first Perk
Win 10 multiplayer games
Play as an alien in a multiplayer game
Never die during a single multiplayer match
Lower the bridge
Find a new weapon
Find an alien weapon
Use any weapon’s secondary fire mode
Play as a human in a multiplayer game
Join a multiplayer game
Complete single player campaign on any difficulty level
Complete single player campaign on Brutal difficulty
Defeat AA-19 Combat Mech
Defeat GX-7 Destroyer Prototype
Defeat Vorus Primus
Defeat DF9 Sentry Mech
Defeat Vorus God Mech
Use all weapons
Kill an enemy with every weapon
Defeat all Bosses
Find all weapons
1500 Total Kills
Unlock all player perks
Set the docking tower centrifuge to overdrive
Destroy the security control room
Complete single player campaign on Normal difficulty
Complete single player campaign on Hard difficulty
Complete single player campaign on all difficulty levels
Use every weapon’s secondary fire mode
Play entire campaign using only 1 weapon
500 Kills With Explosions
250 Kills With Melee
80 Kills While Piloting Mech
25 Kills Using Mech To Step On Enemies
Get the most kills during a single multiplayer match
500 Total Headshots
Get the most kills AND never die during a single multiplayer match
Reach a player score of 50,000,000
Completely recover from damage 3 times during a multiplayer match
1000 Promethium Containers Destroyed
Find all audio recordings
Play entire campaign using only the pistol