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