The Zomboss Down Title update for Plants vs. Zombies Garden Warfare has 10 achievements worth 250 gamerscore.
Grow a Doom-shroom, Bamboo Shoot, Fire Peashooter and Ice Peashooter
Summon a Barrel Pirate and Map Pirate Zombie in Gardens & Graveyards
Pick up a Gnome Bomb
Plant 5 Gnome Bombs
Defuse 3 Gnome Bombs
Vanquish 10 Enemies while They are Carrying a Gnome Bomb
Be on the Winning Team for 15 matches of Gnome Bomb
Vanquish 500 Pirate Zombies
Defuse a Gnome Bomb with Less Than 3 Seconds Remaining
Push the Golf-Bomb into the Hole in Cactus Canyon