Ed-0: Zombie Uprising

Samurai is the default class you get with the start of the game. To unlock this achievement, start any 10 missions available (tutorial already counted as one, so if you're starting from scratch - nine more to go).

Again, no dungeons must be completed, only started (including tutorial). To get this ASAP. start "Incident" (first mission) on HELL, don't collect any upgrades, just go through the Tori gate and find nearest enemy. Let them kill you. Repeat 10 times. Done.