Quit the game and then start it again.

Steal something useful from the Hall of Justice

Murphy survived The Whistling Man

Eugene Stine survived The Whistling Man

Sandra Sharpe survived The Whistling Man

Complete Intro Mission (obtainable in Intro Mission only)

Destroy your first machine.

As Psylocke, contest the mission area for 60 seconds in a single match.

Spend mana to learn a spell for the first time.

Defeated a guardian for the first time.

Complete 1 Arcade match.

As Hela, land a 3-player KO streak in Yggsgard: Yggdrasill Path.

Use an Inhibitor for the first time.