Complete all stages with an "S" rank. Enter and complete the Chaos World then chose a kitten in Stage 4 as the best friend for the fox.
Easy "Chaos World Unlocked!" achievement
Complete all stages with an "S" rank. When deciding Kurenai's fate, select the following options.
Admit Kurenai as a player who has cleared the game.
Turn Kurenai into another Game Master.
Easy "Kuon x Sakuya" achievement
Complete all stages with an "S" rank. Enter and complete the Chaos World then chose a rabbit in Stage 4 as the best friend for the fox.
Easy "Takashi x Sakuya" achievement
Complete all stages with an "S" rank. Enter and complete the Chaos World then chose a puppy in Stage 4 as the best friend for the fox.
Easy "The cat's identity." achievement
This is earned in Stage 5 after doing either of the following.
Follow the "A" rank route in Stage 4 by selecting "Ignore him" then any of the other choices. The cat will be selected by default.
Follow the "S" rank route in Stage 4 by selecting "Look at him" then any of the other choices. Select a kitten when the choice between the three animals is offered.
Easy "The dog's identity" achievement
This is earned in Stage 5 after enabling the choice between the three animals in Stage 4 by following the "S"-rank route by selecting "Look at Him", then any of the other choices. Then, choose a puppy.
Easy "The rabbit's identity" achievement
This is earned in Stage 5 after enabling the choice between the three animals in Stage 4 by following the "S"-rank route by selecting "Look at Him", then any of the other choices. Then, choose a rabbit.