Kill a sniper without getting near him

Defeat the Keymaster

Collect every single collectible item in the game

Kill 5 enemies within 10 seconds using just your sword

Kill a Splitter before it manages to split itself

Force enemies to kill 4 of their allies using Overlord

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

Kill 3 enemies with a single use of Surge

Kill 23 enemies in a row without dying

Kill 3 enemies with a single use of Blink

Block Warden's attack 5 times in a row

Kill an enemy with a projectile reflected by Tempest

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