Light and Nefarius now have 100% AGC! Congrats!
It would never be possible without Pew-pew, the absolute boss! He managed to contact the developers and they fixed an achievement that was unobtainable for more than 7 years!
Thank you, Pew-pew and TripWire Interactive!

!!!WARNING!!! YOU'LL HAVE A RISK OF GETTING INVALIDATED ON ASTATS FOR DOING THIS TRICK. MAY ALSO LOSE YOUR REPUTATION AMONG ASTATS USERS.

1).Get "The First Spark" game. (The Last Photon should work fine as well).
2).Download both "The First Spark" and one of the 6 broken games.
3).Go to their locations and rename "The First Spark.exe" and "The First Spark_data" to the names of similar files in the game you want to fix.
4).Copypaste those 2 files in the folder of the game you want to fix.
5).The .exe file should change its icon now. Open the game you want to fix.

VERY IMPORTANT!!! Go to the registry of "The First Spark" and remove everything there to make the stats clean and to prevent getting all the achievements at once.
(Win+R --> type "regedit" --> find "The First Spark" folder, it should be in HKEY_CURRENT_USER-->SOFTWARE-->Silicon Echo-->The First Spark)

6).You'll start getting achievements after dying 10 times in a row.

Repeat this for every broken game stated in my first post and don't forget to clean the registry every time before starting another fixed game.

P.S. I'm not the person who found the method. Have fun and get rid of these brokens

~~~Thanks to everyone for still being here. Zonitron's bad move made our AGCs suffer, but there is a fix which is being discussed by astats mods. I'm sure all the members will have their AGCs back.~~~

~~~All the profiles were updated and I'm looking for more members now.~~~

~~~I'll also make some new curations and analyzing topics.~~~

~~~Mr.Gryzor, the guy with pre-zonitron 100% has quit Steam. I hope he is having a good time in real life.~~~

~~~Thanks for reading and keep being completionists. You are amazing!~~~

                                                                                                                    Light.

Light's broken achievements count 463-->8
Mikazuki 455-->0
DUKAPb 463-->8

Light's broken achievements count 464-->463...