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