As of most recent patch Phaestus theme dissapeared from extras unlockable menu completely
Went to check what achievements were needed and its entry had dissapeared. All other themes were present however.
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This is intended due to the phaestus theme bound to the hidden achievements, sadly we kinda messed up the surprise by unlocking everything from the start :P
im sorry for the inconvenience, for both, the tease and the mystery behind the hidden achievements ... :D
No problem! I was just worried it had been removed for some reason :) Thanks for the confirmation!