Here is the full list of all 88 I am not a Monster: First Contact achievements.
Get "General" trophy in the game
Get "Hero In Action" trophy in the game
Get "Monster Mastery" trophy in the game
Get "Ruthless" trophy in the game
Get "Perfect Hero" trophy in the game
Recover 10,000 HP
Deal 50,000 damage with bullet weapons
Deal 50,000 damage with energy weapons
Deal 50,000 damage with explosives
Deal 5,000 damage with melee weapons
Infect 100 humans
Kill 1,000 enemies
Save 100 civilians
Get "Officer" trophy in the game
Deal 5,000 damage with explosives
Deal 5,000 damage with bullet weapons
Deal 5,000 damage with energy weapons
Deal 1,000 damage with melee weapons
Kill 100 enemies
Win 20 battles
Get "Hero Certificate" trophy in the game
Fill the morale bar 10 times
Remove infection 3 times
Complete "Portal"
Complete "Sector 17"
Complete "Old School"
Complete "Mr. X"
Complete "Light in the Dark"
Complete "Dark Side"
Complete "Phoenix"
Complete "Vicious Circle"
Complete "Magician"
Complete "Stubbornness"
Complete "New Hope"
Get "Rescuer" trophy in the game
Save 10 civilians
Complete "Laser Power"
Complete "Metro"
Complete "Escape"
Complete "Revelation"
Complete "Indestructible"
Complete "The Belly of the Beast"
Complete "Sisyphean Task"
Complete "Do Not Touch!"
Complete "Do Not Feed the Animals!"
Complete "Plan B"
Complete "Fresh Air"
Complete "Death to Earthlings"
Complete "Whose Shuttle is This?"
Complete "We're Family"
Complete "Call of the Sky"
Complete "Black Sheep"
Complete "Ambush"
Complete "Betrayal"
Complete "Transformation"
Complete "Massacre"
Complete "Diamond Tears"
Complete "On Tiptoes"
Complete "Deadly Party"
Complete "You're Fired!"
Complete "Last Dance"
Complete "Technicalities"
Complete "Welcome!"
Complete "Creature From Space"
Complete "Laser’s Fist"
Complete "Lead Role"
Complete "An Otherworldly Hangover"
Recover 1,000 HP
Win 5 battles
End the battle without getting Guilt
Get "Cruelty" trophy in the game
Kill 10 enemies
Get "Soldier" trophy in the game
Deal 100 damage with explosives
Infect 5 humans
Turn a hero into a monster
Win for the monsters without dying
Deal 100 damage with melee weapons
Use heroic ability 5 times
Recover 100 HP
Deal 100 damage with bullet weapons
Deal 100 damage with energy weapons
Win for the humans without dying
Infect 500 humans
Save 1,000 civilians
Win 500 battles
Get "Space Legend" trophy in the game
Get "Beast" trophy in the game