Kill 3 enemies at once with a falling Drone

Kill a Splitter before it manages to split itself

Kill 3 enemies with a single use of Blink

Force enemies to kill 4 of their allies using Overlord

Fill up GR-SCP so that there are no empty slots left

Defeat Hel

Kill 30 enemies with projectiles reflected using your sword (Reflect module required)

Kill an enemy with a projectile reflected by Tempest

Save the residents of Sector Five

Run 42 kilometers

Escape H.M.P. Offshore on Snooty the Dolphin

Get to the End (Solo Campaign only).

Spend $50000 in Vehicle Shops (Campaign only).