Here is the full list of all 10 Wordament Snap Attack (Android) achievements worth 50 gamerscore.
You made a snap in each of the following shapes
You’ve completed 100 full games
You played on a bonus tile
You created your first Multi-Snap
You played Tap-Snap in more than one language
Played all seven tiles in a Multi-Snap
Created a highest scoring snap
You used swap to create a new snap
Achieve 2,500,000 total points
Achieved "Sore Fingers" and "Addict" and placed in the top 250 of the “Top Player” leaderboards