Here is the full list of all 12 Shred Nebula achievements worth 200 gamerscore.
Beat Levels 1 and 2 in Arcade Adventure Mode.
Collect 500 Crystals in Arcade Adventure Mode.
Beat 3 secret levels in Arcade Adventure Mode.
In Split Screen Score Attack Mode, cooperatively destroy 100 Marauders total.
In Arcade Adventure Mode, collect 7 or more Data-Cores dropped by special enemies.
In Arcade Adventure Mode, destroy all Factories found in the Toxic Sector.
Awarded for your 1,000th frag in ranked Death Match!
Beat Arcade Adventure, starting from Training, in 1 hour and 20 minutes or less.
Crush Arcade Adventure mode with 100% Crystals bonus on all levels including all Secret levels!
Collect all crystals in Single Player Score Attack to reach the secret ending level!
In Arcade Adventure Mode, get the 100% Destructible clear bonus on 4 levels.
Achieve Maximum Overdrive in Arcade Adventure or Single Player Score Attack modes.