I beat FF1 for the first time back in February 2022 through the Pixel Remaster. Even went and got all the Steam achievements! Now, someone I know was playing through the Pixel Remaster so I decided to play through the OG NES version myself.
The achievements here were a good selection that ended up taking two playthroughs. The missables could have been gotten in my first playthrough had I planned a bit more, but I don’t regret taking two playthroughs to get the achievements.
First playthrough was Fighter Monk BlackMage WhiteMage. I went through and got all the chests but never got the class upgrade.
Second playthrough was chestless, Fighter Monk Monk RedMage. I accepted the class upgrade, and completed the challenge achievements I didn’t get on my first run - things like beat KARY with a flame sword or fire spell.
Now I join 65 others who’ve mastered this game :)