Known issueFixUpdated · 2 replies on Steam
Train45: Achievement Steam, Everything Sold Out! (Workarounds)
Short answer
Suggested fix (unconfirmed): Obtain the post-game item from Butler found in the lost item map during the third part of the train. Check if this missing item triggers the achievement.
The problem
wth im pushing this game around 8 hours, completed normal end and true end BUT THE ACHIEVEMENT OF SHOP (at least i've finished yet until SOLD OUT) didn't appear/getting that achievement :(.. so sad 19/20 of total achievement steam pls hewp me :)
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Source: original Steam Community discussion. Quotes are shortened; all credit goes to the posters. Tags: achievement