Here is the full list of all 57 Unreal Tournament 3 achievements.
Get the "Shaft Master" award in 10 matches.
Get the "JackHammer" award in 10 matches.
Get 100 kills with the Eradicator.
Score 500 skulls in Greed.
Grab 200 points worth of betrayal pots.
Become a titan 20 times.
Become a Behemoth 10 times.
Kill an enemy with every vehicle (except hoverboard).
End sprees in 20 matches.
Complete a multiplayer match in every game type.
Play a match with every mutator, using only 1 per match.
Have over 20 minutes of "Invisibility Time".
Have over 10 minutes of "Invulnerable Time".
Complete an Instant Action match in every game mode.
Have over 20 minutes of "Berserk Time".
Complete 10 missions in co-op.
Get the "First Blood" award in 40 matches.
Complete 1 mission in co-op.
Have over 20 minutes of "UDamage Time".
Deliver 50 skulls in one score in Greed against adept or higher skilled bots.
Get the "Gun Slinger" award in 10 matches.
Achieve a Hat Trick in 10 CTF or VCTF matches.
Kill 10 people with spidermines in deathmatch.
10 kills with every Titan weapon in one Titan transformation.
Defeat Akasha and complete the campaign.
Defeat Akasha and complete the campaign in Insane.
Complete Chapter 4.
Complete Chapter 4 in Insane.
Reach 20 kills against a god-like bot in instant action without dying.
Get the "Roadkill" award in 10 matches.
Complete Chapter 3.
Complete Chapter 3 in Insane.
Get the "Killing Spree" award in 20 matches.
Complete Chapter 2.
Complete Chapter 2 in Insane.
Complete Chapter 1.
Complete a campaign in co-op.
Collect every power up on every map.
Get the "Head Hunter" award in 10 matches.
Get the "Combo King" award in 10 matches.
Get the "Biohazard" award in 10 matches.
Get the "Blue Streak" award in 10 matches.
Get the "Rocket Scientist" award in 10 matches and "Flak Master" award in 10 matches.
Get the "Big Game Hunter" award in 10 matches.
Get the "Top Gun" award in 20 matches.
Get "Bullseye" (self-destruct to destroy an enemy) award in 20 matches.
Return 100 Orbs in Warfare matches.
Completed 100 CTF matches played to at least 3 captures.
Complete 100 VCTF matches played to at least 3 captures.
Complete 100 Deathmatch or Duel matches played to at least 20 kills.
Complete 100 Warfare matches played to at least 3 points.
Get the "Monster Kill" award in 20 matches.
Win a multiplayer match on every map.
Get 200 kills in multiplayer on 50 different days.
Win 500 online matches.
20 successful retributions against a betrayer.
Use the Slow Field power-up for over 10 minutes total.