How to unlock "Master of Materia" achievement! EZ & Fast

This achievement is difficult to obtain because it has very specific conditions to fulfill. The most important thing is to master the yellow "Enemy Skill" materia last, which will instantly unlock the achievement.

This solution requires disabling cloud saves.

When the launcher is open, it will delete your save file, so copy it to another folder beforehand. It is located in C:\Users\YOURNAME\Documents\Square Enix\FINAL FANTASY VII Steam\user_7384009

Download the save file from Nexus Mods

https://www.nexusmods.com/finalfantasy7/mods/149

1- Launch Final Fantasy VII on Steam
2- Once the launcher is open, paste the save file
3- Start the game
4- Load the save file
5- You are in Kalm with equipped Materia. You only need 1 AP to reach Master level.

https://images.steamusercontent.com/ugc/16999747910986320202/A5091378714E3656D45A84C62804C49E4959402F/?imw=256&&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

https://images.steamusercontent.com/ugc/14654768057909358205/B7AB32220D6A616D7BCE4B08DF7913DF27F95E14/?imw=256&&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

6- Engage in combat and win.
7- Equip the following Materia, but not "Enemy Skill"
8- Engage in combat and win again until you have all Materia at Master level except "Enemy Skill"
9- Enter Kalm
10- Enter the house located in the upper left corner of the square

https://images.steamusercontent.com/ugc/14445522839532764475/1610DB1C07BB6618743D510A26BC6A095A123175/?imw=256&&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

11- Talk to the Trade the harp to the NPC upstairs for the three Master Materia.

https://images.steamusercontent.com/ugc/17571027513781712634/EA450643930214CC891086A04C511FFC2A52762D/?imw=256&&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

12- Leave the city.
13- Equip all three characters with Enemy Skill.
14- Equip the Manipulation Materia to one of the characters.

https://images.steamusercontent.com/ugc/10395335446586467778/E88DAE1DF1C6892D38F603979F4AAC0EB245E70D/?imw=256&&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

15- Engage in combat until you find the "Custom Sweeper" enemy.

https://images.steamusercontent.com/ugc/13184465452236862683/1AAB60B79775BF3A595D6517AE1F4E674F4C72AF/?imw=256&&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

16- Manipulate it and cast Materia Magic on yourself.

https://images.steamusercontent.com/ugc/18322761825834520954/ECE743393FC682C065C783AA8CD858E1E47D9FA4/?imw=256&&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

17- Defeat the enemy and win the battle.
18- Achievement unlocked, congratulations!