Here is the full list of all 50 Aliens vs. Predator achievements.
Complete all three Campaigns
Complete Predator Campaign on Hard difficulty setting
Destroy the Abomination
Retrieve the second artifact
Kill 20 enemies with the Combi Stick
Find a way into the Research Lab
Survive trial by combat
Retrieve the ancient mask
Discover the Elite Predator's fate
Find the Youngbloods in the Jungle
Find a way through Gateway
Complete Alien Campaign on Hard difficulty setting
Create a new species
Solve the riddle of the Ruins
Escape from the Research Lab
Liberate the Matriarch
Complete Marine Campaign on Hard difficulty setting
Recover Weyland's datapad
Kill 5 enemies with one burst from the smartgun
Defeat the Praetorian
Kill 10 enemies with head shots from the scoped rifle
Get Tequila to surgery
Locate Tequila
Defeat the Matriarch
Kill 30 enemies with the pistol
Help Van Zandt
Escape from C-Block
Survive The 'Party' at The Club
Get all the Aliens vs Predator achievements
Wipe out all of the Marines in the Colony
Harvest all available civilians in the Alien Campaign
Complete Marine Campaign on Nightmare difficulty setting
Complete Alien Campaign on Nightmare difficulty setting
Complete Predator Campaign on Nightmare difficulty setting
Discover all 67 Audio Diaries
Destroy all 50 Royal Jelly Containers
Find all 45 Predator trophy belts
As a team, kill 20 enemies in under 60 seconds in a Survivor match.
Kill 2 enemies with one shot with the shotgun
Kill two enemies with one throw of the Battle Disc
Play and complete your first Ranked Match in standard Deathmatch mode
Win your first Ranked Match in standard Deathmatch mode
Win 10 Ranked Matches in any Deathmatch mode
Kill 10 enemies in a row without dying in a Ranked Match
Achieve Persecutor status more than once in any Ranked Match
Play with six friends in a Ranked Match
Heal or regenerate 30 blocks of health in Survivor
Finish a Ranked Infestation match as the only remaining prey
Get 6000 XP in Ranked Matches
Get 18060 XP in Ranked Matches