Here is the full list of all 25 Stray Shot achievements.
Unlock all 8 arenas
Unlock rank 2 on every arena
Unlock rank 3 on any arena
Unlock rank 4 on any arena
Get all ranks in arena
Finish 3 contracts
Finish 10 contracts
Finish 20 contracts
Finish 40 contracts
Finish 80 contracts
Reach level 3 on daily mode
Reach level 7 on daily mode
Reach level 12 on daily mode
Get 100 pts on a month in daily mode
Get 150 pts on a month in daily mode
Score 10000 pts in gauntlet mode
Gather 10 coins in gauntlet mode
Score 30000 pts in gauntlet mode
Score 10000 pts on a single arena in gauntlet mode
Score 60000 pts in gauntlet mode
Unlock your first clan arena
Get 30 ranks in clan mode
Get 60 ranks in clan mode
Get 120 ranks in clan mode
Get all ranks in clan mode