You defeated 3 enemies in one battle while your buddy was knocked out.

You've farted on people 100 times.

Exit the Medical Healing Suites

Stand on the head of the statue in the intro

Fall and respawn once

Revealed the name of the ship

Maxed Alex and Julia's Relationship

Get the Power Cell from the Pelican

Beat the Training Dummy

Finish an online race.

Collect 100 Precursor Orbs

Open the Precursor Door

Use every available toilet in South Park and achieve the highest mastery level for each