Use all throwing weapons at least once

Complete chapter five barehanded

Beat the epilogue

Beat the main story

Perform a 12x combo

Kill 99 dogs

Engaged in a little touching in the Communication Room.

Complete your first mission.

Throw a weapon at an enemy so that his weapon hits another

Sonic Games - Get 500 rings

Collect 2 of either Roid Rage, The Virus, Growth Hormones, Experimental Treatment, or Speed Ball

Complete all Secret Missions