Here is the full list of all 19 Lamentum achievements.
Unlock the Sacrifice ending.
Unlock the Redemption ending.
Unlock the Ritual ending.
Unlock the Cowardice ending.
Find the mysterious lady outside Grau Hill.
Some words are written in blood.
The origami dragonfly.
Help the illusionist escape from Grau Hill.
Find Lily at the Grau Hill exit.
Welcome to Grau Hill.
The nightmare begins.
Can you decipher a language lost in time?
The strange old man.
Descend through the spirals of madness.
A pathetic violinist.
Love is eternal.
Who is on the other side of the mirror?
Will you come back for me?
The end of the nightmare.