Here is the full list of all 85 Hextones achievements.
All Hextones Placed in a match
Connected 2 Sides by Color - Tier 5
Connected 4 Sides by Color - Tier 5
Connected 6 Sides by Color - Tier 5
Connected 5 Sides by Color - Tier 4
Connected 6 Sides by Color - Tier 4
Connected 3 Side by Color - Tier 4
Connected 4 Sides by Color - Tier 4
Connected 6 Sides by Color - Tier 3
Connected 2 Sides by Color - Tier 3
Connected 3 Sides by Color - Tier 3
Connected 1 Side by Color - Tier 6
Connected 4 Sides by Symbol - Tier 6
Connected 2 Sides by Symbol - Tier 6
Connected 3 Side by Color - Tier 5
Connected 2 Sides by Symbol - Tier 5
Connected 5 Sides by Symbol - Tier 5
Connected 6 Sides by Symbol - Tier 5
Connected 4 Sides by Symbol - Tier 5
Connected 1 Side by Color - Tier 4
Connected 3 Sides by Symbol - Tier 4
Connected 2 Sides by Symbol - Tier 4
Connected 5 Sides by Symbol - Tier 4
Connected 6 Sides by Symbol - Tier 4
Connected 1 Side by Symbol - Tier 4
Connected 6 Sides by Symbol - Tier 3
Connected 5 Sides by Symbol - Tier 3
Connected 4 Sides by Symbol - Tier 3
Connected 5 Sides by Symbol - Tier 2
Connected 6 Sides by Symbol - Tier 2
Connected 4 Sides by Symbol - Tier 2
Connected 5 Sides by Symbol - Tier 1
Connected 2 Sides by Symbol - Tier 3
Connected 3 Sides by Symbol - Tier 3
Connected 5 Sides by Color - Tier 3
Connected 4 Sides by Color - Tier 3
Connected 1 Side by Symbol - Tier 3
Connected 1 Side by Color - Tier 3
Connected 6 Sides by Color - Tier 2
Connected 2 Sides by Symbol - Tier 2
Connected 1 Side by Symbol - Tier 2
Connected 5 Sides by Color - Tier 2
Connected 1 Side by Color - Tier 2
Connected 3 Sides by Color - Tier 2
Connected 4 Sides by Symbol - Tier 1
Connected 6 Sides by Symbol - Tier 1
Connected 3 Sides by Symbol - Tier 2
Connected 4 Sides by Color - Tier 2
Connected 2 Sides by Color - Tier 2
Connected 6 Sides by Color - Tier 1
Connected 2 Sides by Symbol - Tier 1
Connected 5 Sides by Color - Tier 1
Connected 3 Sides by Symbol - Tier 1
Connected 4 Sides by Color - Tier 1
Connected 3 Sides by Color - Tier 1
Connected 1 Side by Symbol - Tier 1
Connected 2 Sides by Color - Tier 1
Connected 1 Side by Color - Tier 1
Connected 2 Sides by Color - Tier 4
Connected 1 Side by Color - Tier 5
Connected 5 Sides by Color - Tier 5
Connected 2 Sides by Color - Tier 6
Connected 3 Sides by Color - Tier 6
Connected 4 Sides by Color - Tier 6
Connected 5 Sides by Color - Tier 6
Connected 6 Sides by Color - Tier 6
Connected 4 Sides by Symbol - Tier 4
Connected 1 Side by Symbol - Tier 5
Connected 3 Sides by Symbol - Tier 5
Connected 1 Side by Symbol - Tier 6
Connected 3 Sides by Symbol - Tier 6
Connected 5 Sides by Symbol - Tier 6
Connected 6 Sides by Symbol - Tier 6
Connected 1 Side by Color - Tier 7
Connected 2 Sides by Color - Tier 7
Connected 3 Sides by Color - Tier 7
Connected 4 Sides by Color - Tier 7
Connected 5 Sides by Color - Tier 7
Connected 6 Sides by Color - Tier 7
Connected 1 Side by Symbol - Tier 7
Connected 2s Side by Symbol - Tier 7
Connected 3 Sides by Symbol - Tier 7
Connected 4 Sides by Symbol - Tier 7
Connected 5 Sides by Symbol - Tier 7
Connected 6 Sides by Symbol - Tier 7