Here is the full list of all 20 Pool Nation achievements.
Won 8 Ball Tour
Reach 1500000 Points
Won 9 Ball Tour
Win Online Match
Win One Game In All Rule Sets
Reach 20 minutes in Endurance
First Win Against AI in Versus
Reach 12 minutes in Endurance
Earn 10000 points in one skill shot
Clear the table in Endurance
Reach 8 minutes in Endurance
50 ball streak in Endurance
30 Ball Streak in Endurance
Reach 4 minutes in Endurance
Win First Bonus Match in Tour
Win First Star in Tour
Use a Flashback
Earn 5000 points in one skill shot
Obtained all 298 stars
Win Online Tournament