Defeat 20 enemies with hand-to-hand combat

Destroy 10 mutated pods in any one level of Training Grounds.

Wield the knife in single player or co-op mode.

Execute your first successful barrel roll.

Obtain your first gold medal in the original Wipeout HD Race Campaign.

Complete all test chambers in all courses of co-op

Complete all test chambers in the Excursion Funnels co-op course

Complete all test chambers in the Hard-Light Surfaces co-op course

Perform 2 aerial gestures before touching the ground in co-op

Celebrate your cooperative calibration success

This is that part

Do the same test twice

Master the Propulsion Gel