Danganronpa 2: Goodbye Despair Anniversary Edition

For this achievement you have to use your trip tickets you obtain from Usami from completing the tasks she has given you. It doesn't matter if you complete the last one or not! At least it didn't affect me from getting the achievement.
You use the trip tickets on each of the 15 characters, and you'll need to raise the "Love" meter (that Usami calls it) to 10 hearts (You can talk to Usami to check your progress), once you do that at the end of the 51 days, you'll have a choice to talk to those characters to receive a type of ending with those characters. During the endings it doesn't matter if you choose the wrong dialog option as it will keep re-giving you those dialog options until you pick the right one.
You have to use 10 tickets per character to obtain 10 hearts. It's quite easy! You will have an option take them to different parts around the islands and be given dialog options and you have to pick the best answer. There will be a slight chance that you will have to do a small minigame, that is similar to the class trials with shooting the text that appears on screen, this will also be within the post/websites I'm linking. I will link a website to each character that I have used below. The best answer will give you a full heart whereas some of the other options will not give you a heart or half a heart, meaning you'll need to use more trip tickets. By using the website links below it'll tell you the best place and dialog options for each character.
Note: I was only able to get max 5 characters per island run with completing most of the tasks Usami gives you.

(Credit goes to the amazing people who made these Masterposts! I'm just adding a guide and the links to make it easier for people who wish to play this game and 100% it, without having to do research and digging like I did)

Characters:
Gundham Tanaka: https://www.tumblr.com/danganronpaislandmode/132661660607/gu...

Mikan Tsumiki: https://www.tumblr.com/danganronpaislandmode/130622343286/mi...

Teruteru Hanamura: https://www.tumblr.com/danganronpaislandmode/102526801765/te...

Nagito Komaeda: https://danganronpaislandmode.tumblr.com/post/108835447697/n...

Nekomaru Nidai: https://www.tumblr.com/danganronpaislandmode/103966406483/ne...

Chiaki Nanami: https://aneba.tumblr.com/post/97184960360/chiaki-nanami-dang...

Mahiru Koizumi: https://www.tumblr.com/danganronpaislandmode/109964019411/ma...

Kazuichi Souda: https://www.tumblr.com/danganronpaislandmode/106052572090/ka...

Akane Owari: https://danganronpaislandmode.tumblr.com/post/98845456273/ak...

Fuyuhiko Kuzuryuu: https://danganronpaislandmode.tumblr.com/post/108722809830/f...

Hiyoko Saionji: https://www.tumblr.com/danganronpaislandmode/131507018863/hi...

Ibuki Mioda: https://www.tumblr.com/danganronpaislandmode/98009390418/ibu...

Peko Pekoyama: https://www.tumblr.com/danganronpaislandmode/108781503340/pe...

Sonia Nevermind: https://danganronpaislandmode.tumblr.com/post/129424481231/s...

Byakuya: https://www.tumblr.com/danganronpaislandmode/97642980221/two...