Kill 1000 foes.
Achieve all the hidden pixel mini-games.
Kill 100 foes by roaring at them.
Collect all the Useless Relics.
Complete all the levels.
Read all the signs.
Collect half the Useless Relics.
???
Kill 200 foes.
Kill 8 enemies with a single roar.
Kill 25 foes by roaring at them.
Collect all the Useless Relics in one level.