Hidden Through Time

Level 14 - 20 is the medieval object levels. If it doesn't pop you can reset these levels by pressing Y on it and re-do them. Time stamps for these levels below

Achievement Walkthrough - All Puzzle Solutions:
Time Stamps
Level 1 T-Rex Attack: 1:55
Level 2 Village 2:15
Level 3 Gathering 2:45
Level 4 Rock Expo 3:35
Level 5 Zoo 4:35
Level 6 Hunting Party 6:15
Level 7 Small Market 7:50
Level 8 The Beach 8:20
Level 9 Wraith of Anubis 8:55
Level 10 The Judgement 9:40
Level 11 Queen's Birthday 10:10
Level 12 The Great Pyramid 10:55
Level 13 City 11:40
Level 14 Royal Wedding 12:55
Level 15 Dungeon 13:30
Level 16 Market Place 14:05
Level 17 Ambush 15:30
Level 18 Stone Henge 16:00
Level 19 Jousting Tournament 17:15
Level 20 Castle Attack 18:50
Level 21 Train Station 20:20
Level 22 The Bank 20:55
Level 23 Native Attack 21:35
Level 24 Western Town 22:30
Level 25 The Gold Rush 23:45
Level 26 The Native Village 24:30

For some reason this was glitching for me even beyond just the final achievement.

I completed all the maps at 100%, but the different scenario achievements weren't unlocking at all. I tried deleting my progress, but that didn't work. I ended up deleting my save file from everywhere (including the cloud). Once I went through the maps again, each achievement popped, including the last one.

Obviously, you'll your progress toward the online maps, so if you've been working on those, finish the online before clearing your save files.

Hope this helps!