Here is the full list of all 36 Gloom achievements.
Win in less than 8 minutes and 30 seconds
Leo's blades and both eyes simultaneously
Well that's just sadistic
The book in all its glory
Ten wins in a row
Must be routine at this point
To retrieve what was once lost
Most renowned of them all
Three wins in a row
Win in less than 12 minutes
You've got the hang of it
He had it coming
No more dreaming, no more nightmares
A place for gloom
A grander existence
An embryo of the cosmic way
A pillar of demented faith
A pillar of demented art
A place for ascension
A mirror of null existence
A ghastly tide of salvation
An instrument of ascension
A place for expression and madness
One-of-a-kind weapon
A place for silence and emptiness
A narrator of nightmares
An orphan of spite
All for one
A place for the shunned and forgotten
An agent of secrecy
A fallen deity of envy
An embodiment of deific anger
Resilience is a virtue
A place for the lost and demented
A false prophet of ill omens
You perished in a dream