Blitz

Blitz is a progression achievement that is earned by completing the challenge "Blitz", marking a player’s successful defense against five consecutive Attack-class wave encounters; it functions as a milestone in the game’s progression system to track and reward sustained defensive performance. The achievement ties into wave-based gameplay and progression goals, indicating mastery of base defenses and unit management across multiple Assault waves, and is used by the game to recognize and record this specific in-game accomplishment.