Here is the full list of all 23 BUNNY GARDEN achievements.
Watched Miuka's Happy Ending
Traveled with Miuka
Gifted Pantyhose to All Cast
Watched Rin's Happy Ending
Bought Rin's Champagne
Traveled with Rin
Made a Cast Drunk
Max Zoomed while Making a Drink
Went to a Swimsuit Event
Invited to Rin's Birthday
Played Hand Sumo
First Time at Afters
Played T Game
Took a Photo
First Time at the Shop
Traveled with Kana
Invited to Kana's Birthday
Invited to Miuka's Birthday
Bought Kana's Champagne
Bought Miuka's Champagne
Gifted All the Panties
Watched Kana's Happy Ending
Watched Harem Happy Ending