Complete Chapter III on any difficulty.

Kill 20 enemies with Ironhide's Melee attack in Chapter II.

Destroy 30 enemies while in vehicle form in Campaign.

Change into vehicle form before reaching the change form tutorial in Chapter I.

Take steroids in SP

Defeat the Cycloid

Doodle something on the whiteboard in SP

Kill the Colossus of Rhodes, the Dark Rider, and Theseus

Acquire Typhon's Bane

Defeat the Dark Rider for the first time