Here is the full list of all 23 Umineko When They Cry - there are Answer Arcs achievements.
Complete the EP8 Hidden Tea Party
Master EP5-8.
Complete the EP8 Tea Party
Ending B reached.
Ending A reached.
Find the culprit without any hints.
Get every medal.
Something’s different this time...
Complete the EP7 Hidden Tea Party.
Complete EP7.
Complete the EP7 Tea Party.
And so, the tale begins.
Complete the EP6 Tea Party.
Complete the EP6 Hidden Tea Party.
They cannot save you.
Complete EP6.
Complete the EP5 Hidden Tea Party.
Complete EP5
Complete the EP5 Tea Party.
Battler jumps out Kinzo’s window