This guide and the file is not official in any way, shape or form. I've made it for myself and decided to share so everyone can use it. The file has been tested by a few people, contains no harmful code. I've only added a few lines to the original to make the achievements earnable. It won't make your windows do funny things (it already does without any external help), burn your house down, hit your puppy or ask Zeus to mercilessly rain lightning spears into your butt.
That being said, you should use it at your own risk.

It SHOULD work with every game, but since the tester-pool was limited I can't guarantee it.
Let me know if you have any issues.

For this to work you need my patched file. You can get it HERE[drive.google.com].

Also, here is a Scan report[www.virustotal.com] if anyone needs it.

Extract the archive and place the main.rpa file in the Devil in the Details/game folder. Overwrite the original.(You can make a backup of it if you want, but it's not necessary.) After it's done you can start your game.

So I've made a 'fix' for the 4 broken achievements of the game:
-Oops
-Little White Lie
-Broken Promise, Broken Friendship
-Burning Bridges

Since I don't know where they are supposed to be achieved (except Oops), I've made them pop where I think they should.

If you follow one of the great walkthroughs posted in the guide section, these achievements will be easy to get.

For Oops you have to have 5 love points with Bri on the start of Day 4 and go to the Corridor. When talking to her say that You want to be her hero.(Avoid discussing what happened should work fine too, but don't choose the third option!)

For the rest of the achievements:
First you have to arrange two dates for the same time.

On Day 1 tell Bri to meet you at the science club next day (Go to the Offices, the choices are: Praise her multitasking skills, Try to find a commont interest, Invite her to the science club,How about tomorrow instead?)

On Day 2 meet Luci and arrange a date. (Go to the Track Field, the choices are: Buy her something sweet, Invite her to a game later today.)

On the afternoon you have to choose who you want to date, since you can't date both of them at the same time.

For Little White Lie you can choose anyone and Lie to the other girl.

For Broken Promise, Broken Friendship you have to choose Bri and Make up an excuse.

For Burning Bridges you have to do the same, but the other way around. So choose Luci and Make up an excuse.

I hope you got those broken achievos, here is a Cheryl for your trouble.