Complete 3 Mystery Portal Matches

Killed at least one of every type of Combat machine.

Enter the Chamber of Gnomes.

Enter Infinity as a Zombie.

As a Goat, vanquish a Plant.

As Super Brainz, vanquish 25 Plants with Heroic Fists, and 25 Plants with the Heroic Beam.

Complete 'Gold Rush'.

Enter the Plant Stats room as a Zombie.

Defeat Blue Gnome King.

Complete 'Zero Bark Thirty'.

Complete 'Showdown'.

Complete 'Boom Tombs'.

Reach the boss wave using the Flag of Power in the Backyard Battleground.