Raze 3: (hey, it comes out in June, but these are the quests I would love to see on it when it does come out)
Complete the Human Campaign, Hardness: Medium Complete the Alien Campaign: Harness: Hard Maximum Firepower: Unlock every weapon, ability, equipment, w/e else they put in the game Hardness: Hard Ooh, Secrets: Unlock all (presumably 4) secret achievements Hardness: Medium.
Creeper world, achievemt unlocked, learn to fly, crush the castle, focus, strike force heroes, cursed treasure... Of course, I'm writing about all the sequels and parts of this games