Here is the full list of all 14 Golfing In Aether achievements.
Hit your ball for the first time
Complete a hole with a birdie or better
Get three consecutive birdies or better in one session
Get a birdie or better immediately following a bogey
Get creative with how you reach a hole
Earn your first S rank
Complete a session with only hole-in-ones
Earn at least D rank on at least one variation of every level
Challenge the leaderboard ghost of another player and beat it
Earn S rank on every variation of every level
Complete a session of each of the three game presets (Casual, Competitive, and Race)
Watch either a session replay or leaderboard replay
Reach Level 3 or 18,000 XP
Complete a session in each of the three seasonal themes