Here is the full list of all 16 Gift achievements.
Ship starts to sink
Encountered the girl
Encountered the piggy bank
Reached the middle level of the ship
Encountered the cigarette man
Reached the upper level of the ship
Encountered the old lady
Saw the ending
Saw the continuation of the ending
Encountered all passengers in the lower level of the ship
Encountered all passengers in the middle level of the ship
Encountered all passengers in the upper level of the ship
Recovered some memories
Recovered many memories
Recovered all memories
All achievements unlocked