Here is the full list of all 30 GUILTY GEAR XX ACCENT CORE PLUS R achievements.
You made contact with an alien.
[Mission] Completed 5 mission with any character.
Even with a huge difference in health, you came from behind and won.
[Training] Trained for over 10 hours.
[Story] Saw one ending.
Successfully executed your first throw escape.
[Ranked Match] First victory attained.
[Player Match] 100 battles fought.
[Player Match] First victory attained.
[Arcade] Completed.
You scored your first instant kill.
[Survival] First intrusion occurred.
Game started.
[Arcade] Order Sol defeated.
[Arcade] Completed in difficulty level MANIAC
[M.O.M] Completed.
[M.O.M] Order Sol defeated and completed.
[VS 2P] Battled offline.
[VS CPU] Won against CPU on difficulty level MANIAC.
[Survival] Attained lv. 999 and defeated Gold Order Sol.
[Survival] Selected Time Traveling skill 3 times in a row.
[Survival] Equipped skills Berserk Mode and Limit Break and completed.
[Survival] Classic Survival completed.
Got all character illustrations.
[Mission] Completed all missions with any character.
[Story] Saw all endings.
[Ranking Match] Won 10 in a row.
[Ranking Match] 100 battles fought.
You've fought on all stages.
You threw a chikuwa and dumbbell at your opponent.