Here is the full list of all 32 Snips & Snails achievements.
Start Sullivan's route.
Begin chapter two of Sullivan's route.
Begin chapter three of Sullivan's route.
Begin chapter four of Sullivan's route.
Begin chapter five of Sullivan's route.
Unlock Sullivan's second ending.
Unlock Sullivan's first ending.
Unlock Sullivan's epilogue.
Begin Quinn's Route
Begin chapter two of Quinn's route.
Begin chapter three of Quinn's route.
Begin chapter four of Quinn's route.
Begin chapter five of Quinn's route.
Unlock Quinn's second ending.
Unlock Quinn's first ending.
Unlock Quinn's epilogue.
Start Yuuto's route.
Begin chapter two of Yuuto's route.
Begin chapter three of Yuuto's route.
Begin chapter four of Yuuto's route.
Begin chapter five of Yuuto's route.
Unlock Yuuto's first ending.
Unlock Yuuto's second ending.
Unlock Yuuto's epilogue.
Begin Eryck's route.
Begin chapter two of Eryck's route.
Begin chapter three of Eryck's route.
Begin chapter four of Eryck's route.
Begin chapter five of Eryck's route.
Unlock Eryck's second ending.
Unlock Eryck's first ending.
Unlock Eryck's epilogue.