Full list of all 20 Cross The Boundaries achievements.
The base game contains 10 achievements, and there is 1 DLC pack containing 10 achievements.
Finish the prologue
Choose to let go of Merry
Choose to let go of magic
Bother Sakuya while she cooks
Touch the rabbit in the forest
See the death screen to the end
Break all the floorboards in Kokoro's escape
Write "you" or "koishi" in Koishi's last question
Put the cold monkey in the stove
Answer empty in all 3 spots in the last question of the forbidden spells