Here is a full guide for the maps(area 1-4) with all items and all endings.
Area 1

Area 2

Area 3

Area 4

Endings
-devil gets girl
-keep devils mark
-leave mundaun
-“a souvenir” achievement
kill painter, dont sign pact
-devil gets girl
-keep devils mark
-killed by avalanche
-“staying indefinitely” achievement
rescue painter. sign pact
-girl unharmed
-lose devils mark
-leave mundaun
-“going home” achievement
rescue painter. dont sign pact
-girl unharmed
-lose devils mark
-killed by avalanche
-“staying indefinitely” achievement
Related Posts:
- Reversion The Return All Achievements Guide
- Yogurt!: How to Get 2 Secret Achievements
- Oh Jeez, Oh No, My Rabbits Are Gone!: All Palletes (How to Get the Fashionista Achievement)
- NEKOPARA Vol. 4: 100% Achievements Guide
- Contra Anniversary Collection: All Endings