Unlocking most of the memories is enough to unlock the achievement as well as the free memory mode.
- Operating System
- Windows 10 x64
Steps To Reproduce
- Unlock most of the memories except for a few remaining ones (I missed the helicopter one, the castle one and at least one of the town ones)
- Unlock the another one and the achievement will unlock.
This worked with 3 different combinations of unlocks for me and probably works for all of them.