Here is the full list of all 12 Alien Hominid HD achievements.
Complete first level
Eat 50 KGB Agents with Yeti
Destroy 25 buildings in one game
Complete game on Friendly difficulty
Complete game on Normal difficulty
Complete game on Insane difficulty
10 consecutive head bites without touching the ground
Attain 1000 kills during one game
Unlock all hats
Defeat final boss without using a continue
Survive any challenge mode for 10 minutes
Reach 5000Km in Super Soviet Missile Mastar