Here is the full list of all 22 Tales Across Time achievements.
Complete the 1st Story.
Defeat the Ancient Wyrm.
Explore the Xanthus Ruins and solve its puzzle.
Find every Upgrade Crystal in the 1st Story.
Clear out the Crystal Caverns.
Find every Upgrade Crystal in the 2nd Story.
Find every Upgrade Crystal in the 3rd Story.
Met with James at the ‘secret spot’.
Defeat the Goblin Rider.
Head into the Desert after clearing out the Town.
Complete the 2nd Story.
Explore the Forest and discover the Fortress ruins.
Escape from the Masked Man.
Armour up for the final showdown.
Complete the 3rd Story.
Find and examine the lone sapling.
Find a reference to the past in the 2nd Story.
Find a reference to the past in the 3rd Story.
Combine a 3x Power Up with a Flash Punch attack!
Interrupt a Charging enemy with Dazing Blow!
Speak to everyone in town during the 2nd Story.
Find every Power Cell in the 3rd story (note: this must be completed before visiting the Armoury).