Here is the full list of all 21 Golf Guys achievements.
Unlock your first Bat
Unlock your first Ball
Unlock your first Skin
Unlock 5 Bats
Unlock 5 Balls
Unlock 15 Skins
Unlock all Bats
Unlock All Balls
Unlock All Skins
Open Baron's Pack
Open Duke's Pack
Open King's Pack
Play one map in Zen Mode
Play all maps in Zen Mode
Qualify in 2 rounds after hitting into the water
Qualify in 2 rounds after hitting into the Sand
Hit a hole in a Minigolf map
Hit a hole in a Race map
Hit a hole in a Target map
Win 21 Tournament Games in a row
Play a game in Multiplayer