Full list of all 44 Prey (2006) achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox 360.
Reached 25 Wrench kills
Reached 125 kills total in Team Death Match
Reached 125 kills total in Death Match
Reached 25 Leech Gun kills
Reached 25 Crawler Launcher kills
Reached 25 Acid Sprayer kills
Reached 50 kills total in Team Death Match
Reached 50 kills total in Death Match
Reached 25 AutoCannon kills
"All Fall Down" completed
$250 won on Draw Poker
"Second Chances" completed
"Rites Of Passage" completed
"Downward Spira"l completed
"Escape Velocity" completed
"Last Call" completed
$250 won on Black Jack
Scored over 15,000 on Runeman
Score 25 Sniper kills in Multiplayer
Reached 25 Rifle kills
Score 25 Crawler Grenade kills in Multiplayer
Complete "Prey" on Normal difficulty
Complete "Prey" on Cherokee difficulty
Score over 250 kills in Death Match
Score over 250 kills in Team Death Match
Score 25 Spirit Form kills in Multiplayer
Win a Ranked Multiplayer Match
Play ten Ranked Multiplayer Matches
Complete "Crash Landing"
Complete "Sacrifices"
Complete "There Are Others"
Complete "Guiding Fires"
Complete "The Old Tribes"
Complete "Hidden Agenda"
Complete "Jen"
Complete "The Dark Harvest"
Complete "Following Her"
Complete "The Complex"
Complete "Ascent"
Complete "Center Of Gravity"
Complete "Resolutions"
Complete "Oath Of Vengeance"
Complete "Facing The Enemy"
Complete "Mother's Embrace"