Here is the full list of all 50 Quake 4 achievements worth 1,000 gamerscore. It takes around 1000 hours to unlock all of the achievements on Xbox 360.
Completed Act 1 and Act 2 with the rank of Private.
Completed a level using only the shotgun.
Completed a level using only the nailgun.
Completed a level only using the railgun.
Completed Act 1 with the rank of Lieutenant.
Completed Act 1 and Act 2 with the rank of Lieutenant.
Played over 5000 Ranked Multiplayer Matches.
Achieved the number one rank on the All Gametypes leaderboard.
Over 1000 captures in Ranked matches.
Over 10000 frags in Ranked matches.
Achieved a ranking in the top ten on the All Gametypes leaderboard.
Over 500 captures in Ranked matches.
Over 500 Excellents in Ranked matches.
Over 250 Defense awards in Ranked matches.
Over 100 Assists in Ranked matches.
Played over 1000 Ranked Multiplayer Matches.
Over 5000 frags in Ranked matches.
For heroism in battle, SGT Raffle of Raven Squad has awarded you the Galactic Order of Heroism.
Over 100 captures in Ranked matches.
Completed the game with the rank of General.
Completed a level using only the lightning gun.
Completed Act 1 and Act 2 with the rank of General.
Completed Act 1 with the rank of General.
Over 5000 win points in Ranked matches.
Played over 500 Ranked Multiplayer Matches.
Over 250 players have been humilated by you.
Over 1000 win points in Ranked matches.
Over 250 Impressives in Ranked matches.
Over 500 win points in Ranked matches.
Completed a level using only the dark matter gun.
Completed the game with the rank of Lieutenant.
Over 500 frags in Ranked matches.
Played over 100 Ranked Multiplayer Matches.
Over 100 win points in Ranked matches.
Over 100 frags in Ranked matches.
Completed a level using only the hyperblaster.
Awarded on completion of a level where a shot was landed with every weapon in a full arsenal.
Completed the game with the rank of Private.
Completed a level using only the rocket launcher.
Completed Act 1 with the rank of Private.
Completed a level using only the grenade launcher.
Completed a level using only the blaster.
For courage in battle alongside Viper Squad, CPL Mahler has awarded you the Solar Star of Courage.
Completed a level using only the machine gun.
Completed the game with the rank of Corporal.
Completed Act 1 and Act 2 with the rank of Corporal.
For rescuing PVT Lanier of Eagle Squad, you have been awarded the Sky Marshall's Medal of Valor
Completed Act 1 with the rank of Corporal.
Won a Ranked match without ever being fragged.
Completed a level without taking any damage.