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