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