Here is the full list of all 30 The Dark Pictures Anthology: House of Ashes achievements.
Found every part of Randolph’s journal
Rachel used the machine gun
Merwin fixed the radio
Completed the Solo Story
Five characters survived the finale
Rachel survived after rejecting both her lovers
Jason went back for Salim and they both made it to the elevator
Salim killed five creatures using his spear
Escaped the vault without any lingering injuries
Eric helped Rachel purge her infection
Rachel witnessed the origin of the creatures.
Eric discovered the unexpected effects of the UV wand
Kurum and Balathu chose to fight together
Eric and Rachel both died in the same explosion
Three characters used the UV wand to attack the creatures
Clarice killed Eric after becoming infected
Rachel became infected and killed Eric, or Eric killed her
Salim returned home to his son
Everyone died in the finale
Nick killed the ancient warrior with a stake
Only one character survived the finale
Eric and Nick shared a moment in the elevator
Chose only Head decisions
Found all of the Black Framed Pictures
Found all of the White Framed Pictures
Found all of the Secrets
Finished the prologue in Movie Night
Eric ignored Nick’s radio signal
Rachel was not rescued from her cocoon
Balathu made two kills with his spear