Here is the full list of all 21 Our Journeys A Collection of Visual Novels achievements.
Get the third Deadly End (Miller’s Blood)
Get the second Deadly End (Miller’s Blood)
Alive to the End Ending (Miller’s Blood)
Zombie Jack Ending (Miller’s Blood)
Super Between Ending (Miller’s Blood)
Get the first Deadly End (Miller’s Blood)
Normal Life Path End (I’m a Barrier)
Rift Breaker Path End (I’m a Barrier)
Beginning Path (I’m a Barrier)
Get the first Bad End (The Four Alice)
Get the second Bad End (The Four Alice)
Get the Good Ending (The Four Alice)
Get the third Bad End (The Four Alice)
Get the third Game Over End (Lorange and the Domain)
Get the second Game Over End (Lorange and the Domain)
Get the fourth Game Over End (Lorange and the Domain)
Get the Alternate Ending (Lorange and the Domain)
Get the True Ending (Lorange and the Domain)
Get the fifth Game Over End (Lorange and the Domain)
Get the first Game Over End (Lorange and the Domain)
The controls (Lorange and the Domain)