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