Here is the full list of all 19 Party Jousting achievements worth 1,000 gamerscore.
Secret
In joust: Destroy an opponent with a dive bomb
In Joust: Destroy a laying animal with the laser gun
In Joust: Destroy two animals, without jumping in between
In Bagatelle: Destroy two opponents with one ball
In Bagatelle: Take both big coins
In Bagatelle: Keep a ball alive for 20 seconds
In Golf: Hit an opponent with a bomb
In Golf: Pick a flag-coin and enter the hole - in one strike!
In Golf: Collect 3 flag-coins in one strike
In Golf: Travel through spikes, without taking damage
In Car-ball: Strike the ball with the paddle
In Car-ball: Destroy two cars, in a quick session
In Car-ball: Score two goals without touching the walls
In Match3: Gain a three-combo
In Match3: Play until the time runs out