Here is the full list of all 16 Baseball Riot achievements.
Knock out all enemies in a level with the first swing and only with headshots in region 8.
Collect three briefcases with a single swing in region 7.
Collect three stars from every level in region 6.
Get five headshots with a single swing in region 3.
Swing a ball that bounces 100 times in region 3.
Knock everyone out with the first swing in a single level in region 2. Explosions don't count.
Knock out four scientists with a single swing in region 7.
Destroy three vending machines with a ball and a single swing in region 5.
Collect four extra balls during one level in region 5.
Knock out six enemies with a single Explodz explosion in region 4.
Destroy 10 pieces of glass during one level in region 4.
Earn at least two stars from each level in region 2.
Knock out 5 enemies with a single swing in region 1.
Earn at least two extra balls during one level in region 1.
Complete a level with a single swing while collecting all stars in region 6.
Get a region score of 40 points or higher in region 8.