Iron Sea Defenders achievements

Destroyed 20,000 enemies throughout the entire game.

Used bonuses 10 times on a single level.

Installed all types of weapons accessible on a level.

Sold 10 weapons on a single level.

Place all towers available in the episode

Placed all types of weaponry accessible in the episode on a single tile.

Completed a level without improving weaponry.

Completed a level with the time machine's health below 10 points.

Unlocked a tile for anchors on any level.

Kill 500 enemies with the secret weapon

Didn't let a single enemy reach the fort throughout a level.