https://disgaea.neoseeker.com/wiki/Dark_World_(Disgaea_2)

^ Axel mode has additional dark world stages.

I am fairly sure Axel's Dark World stages don't count towards the achievement, as I didn't bother doing them myself, so Jyudark should've gotten it if they indeed have cleared all DW stages in Adell mode.

Did you get the cutscene with Plenair and got the Usagi's Journal? If not, I'd double check if you missed any of them (some are rather easy to miss, like the very first one is unlocked by default, so you don't ever have to clear it).

Originally posted by neemoos:

I am fairly sure Axel's Dark World stages don't count towards the achievement, as I didn't bother doing them myself, so Jyudark should've gotten it if they indeed have cleared all DW stages in Adell mode.

Did you get the cutscene with Plenair and got the Usagi's Journal? If not, I'd double check if you missed any of them (some are rather easy to miss, like the very first one is unlocked by default, so you don't ever have to clear it).

i'm 100% sure I cleared all the dark world stages 1 time each. I checked it. The Pleinair and Usagi custscene didn't appear

Originally posted by neemoos:

I am fairly sure Axel's Dark World stages don't count towards the achievement, as I didn't bother doing them myself, so Jyudark should've gotten it if they indeed have cleared all DW stages in Adell mode.

Did you get the cutscene with Plenair and got the Usagi's Journal? If not, I'd double check if you missed any of them (some are rather easy to miss, like the very first one is unlocked by default, so you don't ever have to clear it).

My bad, I didn't unlock stage 11-7 (Clear the stage with only using tower attacks).