Here is the full list of all 40 YesterMorrow achievements.
Banish 20 Shadows with Dash
Collect 5 Timekeeper artefacts
Banish 20 Shadows with Megastomp
Use all Timekeeper skills at least once
Learn the sixth special ability
Beat the fifth boss
Expand your hit points to 10 or more
Pet 30 animals
Complete Desert island (story and collectibles)
Learn the fifth special ability
Beat the fourth boss
Light up 50 Everlight lanterns
Beat the third boss
Banish 100 Shadows in one playthrough
Learn the fourth special ability
Expand your hit points to 7
Cleanse 50 creatures
Learn the third special ability
Beat the second boss
Pet 20 animals
Learn the second special ability
Cleanse 10 creatures
Learn the first special ability
Roll 500 times
Beat the first boss
Pet 10 animals
Gain Eversight
Banish 20 Shadows with Bombs
Beat the sixth boss
Beat the final boss
Restore the Conduit without the proper tools
Restore the Conduit using Timekeeper artifacts
Pet all domestic animals
Complete Forest island (story and collectibles)
Complete Ice island (story and collectibles)
Cleanse 150 animals
Unlock all journal entries
Throw a bomb at a NPC
Collect all map fragments
Collect all Timekeeper artefacts