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