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