Here is the full list of all 12 Throne Together achievements worth 200 gamerscore.
Get 195 Stars across all levels
Received an extra life from 5 friends
Turned 25 gargoyles into fountains
Beat a timed level with more than 30 seconds left on the clock
Got 100 Stars across all levels
Lit up 30 torches
Built 50 blueprints
Completed a level with at least 30 cracked blocks
Repaired 100 cracked blocks with cement
Got 10 Stars across all levels
Completed a level with at least 20 enclosed spaces
Simultaneously juggled 7 blocks in play at the same time