Kill 1,000 Aliens (Gold): Cleared first 1,000 enemies.
Kill 100,000 Aliens (Gold): Cleared first 100,000 enemies.
Retaliator (Gold): Clear 3/4 of levels in Arcade Mode.
Wrath of Solar Division (Gold): Clear half of the levels in Arcade Mode.
Zotrix Eraser (Gold): Beat first boss in Arcade Mode.
Zotrix Exterminator (Platinum): Earn all other Zotrix trophies.