Here is the full list of all 22 GunFu Heroes achievements.
Kill ten players in combat
Kill a target with a laser after it has bounced three times.
Slip on a discarded banana peel.
Reflect 500 bullets.
Perfectly reflect 500 bullets.
Reflect a bullet 10 times consecutively.
Accidentally shoot yourself.
Purchase every item in the store.
Get 100 pistol kills.
Get 100 rifle kills.
Get 100 burst rifle kills.
Get 100 Banana gun kills.
Get 100 Laser gun kills.
Get 100 SMG kills.
Get 100 shotgun kills.
Get 100 sniper kills.
Get 100 minigun kills.
Travel 500 miles with the grapple gun.
Get 100 trumpet kills.
Get 100 trishot kills.