Here is the full list of all 23 Long and Hard... Summer! achievements.
Complete all the levels in the game that you can play on your PC at home.
Complete the quest 'Party Time!'.
Build a stronger bond (heart level 3) with Yui Harada.
Build a stronger bond (heart level 3) with Kaname Mao.
Complete the quest 'The Old Babbler'.
Build a stronger bond (heart level 2) with Yui Harada.
Build a stronger bond (heart level 2) with Kaname Mao.
Build a stronger bond (heart level 3) with Akari Tanaka.
Get a score of 10 000 or more in the arcade game.
Get at least a 'D' grade till Friday, week 8.
Complete the quest 'Not a Nuisance'.
Complete the quest 'Sweet Secret'.
Build a stronger bond (heart level 2) with Akari Tanaka.
Complete the quest 'Spooky Refrigerator'.
Build a stronger bond (heart level 1) with Kaname Mao.
Complete the quest 'Bare Rivals' and beat Kaname's record in the arcade game.
Complete the quest 'The Real Culprit'.
Complete the quest 'Bills, Bills Everywhere'.
Build a stronger bond (heart level 1) with Yui Harada.
Complete the quest 'School's Computer'.
Build a stronger bond (heart level 1) with Akari Tanaka.
Complete the quest 'Someone to Hug'.
Complete the quest 'Leaking Pipe'.