Here is the full list of all 27 Otakus Adventure achievements.
Complete all shooting games without being hurt.
A telescopic gun can be used only once to achieve its goal.
Perform the operation without making mistakes.
Hit the box in the park 30 times during the shooting game.
Drink water.
Complete the figure in my room.
Don't splash outside the toilet when you go to the toilet.
Complete the flight game inside the mobile phone without being hurt.
Be with girl No.2.
Complete all boxing games without being hurt.
Complete the game of space flight without being hurt.
Find an assistant without making mistakes.
Win the game with a score of 3-0 in arcade hall.
In order to love him, buy his photo album.
Defeat the first hero when the whole team reaches level 5.
Exercise all characters to the extreme in a different world.
Complete your house in a different world.
Find Michael's secret.
Be with girl No.1.
Thread a needle in one try.
Play all the sleeping games at Bobo's home in one row.
Take a sleeping pill and go to sleep at Bobo's house.
Defeat all bosses in a different world.
Don't break the flashlight in Inverted Castle.
Make all endings.
After save the arcade hall, be with girl No.3.
Save Waifu and the world