In order to unlock the Back in Time Blueprint, you will need to complete the Stabilizing Time quests. This consists of 10 quests in total that you will do while inside Al De Baran, Clock Tower 1F, and Clock Tower 2F.
STABILIZING TIME
- The Clock Tower's Secret
- Clock Tower Explorer
- Time Explorer
- Appealing to Time
- Complete the 3 Minstrel Tasks
- Mogarda - time
- Legend of the Werewolf
- Mosman Time
- The Riddle of Time
Once you have completed the Stabilizing Time quests, the Back in Time Blueprint will be unlocked.
You will now be able to buy the Back in Time Blueprint in the Tattered Time Pointer store for 19755 Tattered Time Pointers.
There's no sequence to the quests. You can complete them however you want. Goodluck!