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