Full list of all 24 Gem Forge achievements.
The base game contains 10 achievements, and there is 1 DLC pack containing 14 achievements.
Royal Brilliant
Perfect Brilliant
Regular Brilliant
Royal Ruby
Perfect Ruby
Regular Ruby
Perfect Emerald
Star Emerald
Square Emerald
Triangular Amethyst
Make more than 20 chained items on the field, and then halve their number in 8x8 mode
Royal Brilliant for 8x8 mode
Survive first 500 moves
Survive first 250 moves
Survive first 250 moves in 8x8 mode
Make 10 000 000 score in 8x8 mode
Perfect Brilliant for 8x8 mode
Make 5 000 000 score in 8x8 mode
Regular Brilliant for 8x8 mode
Royal Ruby for 8x8 mode
Break chained item that was in place at least for 10 moves in 8x8 mode
Make 20 000 000 score in 8x8 mode
Make 30 000 000 score in 8x8 mode
Survive first 500 moves in 8x8 mode