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