You've acquired S Rank in "The Bell-Stealing Drill".

Reach the maximum Level for one Class

Complete any Mission in Operations mode on Ruthless Threat Level

Customise a full Armour set for one Class

As an Assault, hit 500 total enemies with Ground Pound

Collect all Dataslates

Reanimate The Sword of Atreus

Destroy the Chaos warp beacon

Kill 5 enemies while they are conducting a Call for Reinforcements

Defeat the Lord of Change and face a figure from the past

Break a Scarab Occult Terminator's Melee Combo Attack with 2 Perfect Parries in a row

Kill a Lesser Sorcerer while he's reviving a Rubric Marine