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