Here is the full list of all 12 A Little Golf Journey achievements.
Shoot 100 perfect power shots
Collect one star
Get a hole in one
Hit each of the boats
Collect all stars
Collect all Blue Things
Get the first ending
Break 6 ancient jars in one shot
Go through 4 ruined windows in 1 shot
Complete all minigolf levels
Complete each of the caverns
Complete the 6th level of the Caverns of Persistence in 24 shots