Here is the full list of all 31 Riddles Of The Past achievements.
Evil genius is defeated!
Found a burner
Found a chip
Turned anabiosis capsule off
Found a red book
Crimes history revealed
You found a robot blueprint
Found a film
Discovered an enemy
Found Clarck's ring
Remote control is lost
Found a light bulb
Recall the marriage proposal
Found a player badge
Found a dancer figure
Found football player photo
Found a folder with a card file
Found access key
You've met the bartender
Found a menu
Found jack blueprint
Found a newspaper
Found a gas bill
They took Fred!
Found a ticket
Found an old poster
You came to the Riverside
Found a magnifying glass
Recall what happened on stadium
Found heart shaped pendant
Found a photo album