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