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