Level 10 requires 90,000XP.
There are various ways to gain XP, which will come over time easily whilst acquiring the other achievements in the game.
The early beginning way i used to gain XP is to play tournament with no buy-in against one opponent.
Id check/call until the River card had been placed on the table then go all-in.
This got me 1,275XP per hand for:
Dealt in! - 50XP
All-in to win!- 225XP
River Captain! - 500XP
Winning Streak! - 500XP (Assuming you've won one hand prior)