Here is the full list of all 30 Guilty Gear XX Accent Core Plus achievements worth 400 gamerscore.
[Mission] Complete 5 mission with any character.
Game started.
[Arcade] Complete with any character (any difficulty)
[Arcade] Defeat Order Sol.
[Arcade] Complete in difficulty level MANIAC (with any character)
[M.O.M] Complete it.
[M.O.M] Defeat Order Sol and complete.
[VS 2P] Battle offline.
[VS CPU] Fight against CPU on difficulty level MANIAC and win.
[Survival] First intrusion will occur.
[Survival] Reach Lv. 999 and defeat Gold Order Sol.
[Survival] Select Time Traveling skill 3 times in a row.
[Survival] Equip skills Berserk Mode and Limit Break and complete.
[Survival] Complete Classic Survival.
[Training] Train for over 10 hours.
Get all character illustrations.
[Mission] Complete all missions with any character.
[Story] See one ending with any character.
[Story] See all endings.
[Ranked Match] Get your first victory.
[Ranked Match] Win 10 in a row.
[Ranked Match] Fight 100 battles.
[Player Match] Get first victory.
[Player Match] Fight 100 battles.
Even with a huge difference in health, you came from behind and won.
Score your first instant kill.
Successfully execute your first throw escape.
Fight on all stages.
Make contact with an alien.
Throw a chikuwa and dumbbell at your opponent.