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