Save a turret from redemption

Make a break for it

Defeat 20 enemies with headshots

Defeat 20 enemies with hand-to-hand combat

Find one treasure

Complete Leading the Charge.

Defeat 50 enemies in powered down areas while no missions are active.

Have mastered the Stomp technique

Finish the game in Easy Mode

Kill 10 enemies with thrown-back grenades

Defeat 20 enemies by blind-firing while in cover (without aiming with L1/R1)

Throw back a grenade and defeat two enemies at once

Achieved an S Rank with Sonic the Hedgehog for the first time