Achievements:
Naughty
Objective: Destroy 50 destructible items
Revenge
Objective: Kill 20 enemies using environmental damage only
Pissed Off (Tier: Easy)
Objective: Kill 10 enemies within 10 seconds on difficulty Easy or higher
Retirement (Tier: Easy)
Objective: Kill 5 enemies with one shot on difficulty Easy or higher
Bad Boy
Objective: Kill 100 enemies
Pissed Off (Tier: Normal)
Objective: Kill 10 enemies within 10 seconds on difficulty Normal or higher
Retirement (Tier: Normal)
Objective: Kill 5 enemies with one shot on difficulty Normal or higher
No Bananas Today (Tier: Easy)
Objective: Kill 2 Gorillas within 20 seconds on difficulty Easy or higher
Perceptive
Objective: Find 5 secrets
Monkey Business (Tier: Easy)
Objective: Kill a Gorilla within 5 seconds on difficulty Easy or higher
Blizzard (Special)
Objective: Kill 50 enemies with electricity only
Hooligan
Objective: Destroy 500 destructible items
Big Brother's Eyes
Objective: N/A
No Bananas Today (Tier: Normal)
Objective: Kill 2 Gorillas within 20 seconds on difficulty Normal or higher
Patient (Tier: Easy)
Objective: Kill a Heavy Grenadier on difficulty Easy or higher
Monkey Business (Tier: Normal)
Objective: Kill a Gorilla within 5 seconds on difficulty Normal or higher
Pyromaniac
Objective: Blow up 50 explosive barrels
Overkill (Tier: Easy)
Objective: Kill 10 enemies with one shot on difficulty Easy or higher
Mechanic (Tier: Easy)
Objective: N/A
Rookie
Objective: Collect 10 full N.A.N.O. bars
Boredom No More (Tier: Easy)
Objective: Kill a Heavy Grenadier within 30 seconds on difficulty Easy or higher
Retaliation
Objective: Kill 200 enemies using environmental damage only
Patient (Tier: Normal)
Objective: Kill a Heavy Grenadier on difficulty Normal or higher
Killer
Objective: Kill 1000 enemies
Power Down (Tier: Easy)
Objective: N/A
Overkill (Tier: Normal)
Objective: Kill 10 enemies with one shot on difficulty Normal or higher
Mechanic (Tier: Normal)
Objective: N/A
Searcher
Objective: Find 25 secrets
Suicide Mission (Tier: Easy)
Objective: N/A
Power Down (Tier: Normal)
Objective: N/A
Veteran
Objective: Collect 20 full N.A.N.O. bars
Boredom No More (Tier: Normal)
Objective: Kill a Heavy Grenadier within 30 seconds on difficulty Normal or higher
Furious (Tier: Easy)
Objective: Kill 20 enemies within 15 seconds on difficulty Easy or higher
Pissed Off (Tier: Hard)
Objective: Kill 10 enemies within 10 seconds on difficulty Hard or higher
Retirement (Tier: Hard)
Objective: Kill 5 enemies with one shot on difficulty Hard or higher
Suicide Mission (Tier: Normal)
Objective: N/A
Sergeant
Objective: Complete the game on difficulty Normal or higher
Resistant
Objective: Complete any other level than the first one with no deaths on difficulty Normal
Furious (Tier: Normal)
Objective: Kill 20 enemies within 15 seconds on difficulty Normal or higher
No Bananas Today (Tier: Hard)
Objective: Kill 2 Gorillas within 20 seconds on difficulty Hard or higher
Monkey Business (Tier: Hard)
Objective: Kill a Gorilla within 5 seconds on difficulty Hard or higher
Patient (Tier: Hard)
Objective: Kill a Heavy Grenadier on difficulty Hard or higher
Pissed Off (Tier: Insane)
Objective: Kill 10 enemies within 10 seconds on difficulty Insane
Retirement (Tier: Insane)
Objective: Kill 5 enemies with one shot on difficulty Insane
Overkill (Tier: Hard)
Objective: Kill 10 enemies with one shot on difficulty Hard or higher
Armoured
Objective: Buy all Combat Gear Upgrades
Mechanic (Tier: Hard)
Objective: N/A
Electrician
Objective: Buy all N.R.G. Weapon Upgrades
Engineer
Objective: Buy all CLN Firearm Upgrades
Power Down (Tier: Hard)
Objective: N/A
Hawk Eye
Objective: N/A
Suicide Mission (Tier: Hard)
Objective: N/A
Colonel
Objective: Complete the game on difficulty Hard or higher
Monkey Business (Tier: Insane)
Objective: Kill a Gorilla within 5 seconds on difficulty Insane
Boredom No More (Tier: Hard)
Objective: Kill a Heavy Grenadier within 30 seconds on difficulty Hard or higher
Furious (Tier: Hard)
Objective: Kill 20 enemies within 15 seconds on difficulty Hard or higher
Patient (Tier: Insane)
Objective: Kill a Heavy Grenadier on difficulty Insane
Elite
Objective: Collect 41 full N.A.N.O. bars
No Bananas Today (Tier: Insane)
Objective: Kill 2 Gorillas within 20 seconds on difficulty Insane
Overkill (Tier: Insane)
Objective: Kill 10 enemies with one shot on difficulty Insane
Immune
Objective: Complete any other level than the first one with no deaths on difficulty Hard
Mechanic (Tier: Insane)
Objective: N/A
Power Down (Tier: Insane)
Objective: N/A
Vandal
Objective: Destroy 5000 destructible items
Immortal
Objective: Complete any other level than the first one with no deaths on difficulty Insane
Suicide Mission (Tier: Insane)
Objective: N/A
Furious (Tier: Insane)
Objective: Kill 20 enemies within 15 seconds on difficulty Insane
General
Objective: Complete the game on difficulty Insane
Boredom No More (Tier: Insane)
Objective: Kill a Heavy Grenadier within 30 seconds on difficulty Insane
Enraged (Tier: Easy)
Objective: Kill 30 enemies within 20 seconds on difficulty Easy or higher
Extermination (Tier: Easy)
Objective: Kill 20 enemies with one shot on difficulty Easy or higher
Extermination (Tier: Normal)
Objective: Kill 20 enemies with one shot on difficulty Normal or higher
Treasure Hunter
Objective: Find all the secrets in the game
Enraged (Tier: Normal)
Objective: Kill 30 enemies within 20 seconds on difficulty Normal or higher
Enraged (Tier: Insane)
Objective: Kill 30 enemies within 20 seconds on difficulty Insane
Extermination (Tier: Insane)
Objective: Kill 20 enemies with one shot on difficulty Insane
Extermination (Tier: Hard)
Objective: Kill 20 enemies with one shot on difficulty Hard or higher
Enraged (Tier: Hard)
Objective: Kill 30 enemies within 20 seconds on difficulty Hard or higher
Death Incarnate
Objective: Kill 10000 enemies
Avenging Angel
Objective: Kill 2000 enemies using environmental damage only