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