Here is the full list of all 14 Simona's Requiem achievements.
Beat the Death Mask
Die 3 times in Time lord fight
Beat the Time Lord
Beat the False Custodian
Speak to every inhabitan once
Get the double jump upgrade
Get the dash upgrade
Get the teleport crystal
Beat the final boss
Finish the game
Get fire upgrade
Get all upgrades
Find one epitaph
Find all epitaphs