Full list of all 31 Final Fantasy VII achievements worth 1,000 gamerscore. It takes around 25-30 hours to unlock all of the achievements on Xbox One.
Reach Lv. 99 with one character
Complete FINAL FANTASY VII
Obtain 99,999,999 gil
Obtain the Knights of the Round Materia
Defeat Ruby Weapon
Learn Chaos—Vincent's last Limit Break
Obtain the Master Summon Materia
Defeat Emerald Weapon
Learn Omnislash—Cloud's last Limit Break
Defeat Diamond Weapon
Obtain the Bahamut ZERO Materia
Learn Highwind—Cid's last Limit Break
Learn Final Heaven—Tifa's last Limit Break
Learn Catastrophe—Barret's last Limit Break
Raise a Materia to Lv. 5
Learn All Creation—Yuffie's last Limit Break
Obtain the Leviathan Materia
Obtain the Bahamut Materia
Learn Great Gospel—Aeris's last Limit Break
Go on a date with Barret in the Gold Saucer
Learn Cosmo Memory—Red XIII's last Limit Break
Have Vincent join your party
Learn Slots—Cait Sith's last Limit Break
Win the Chocobo Racing mini-game
Score 10,050 points or more in G-Bike at the Gold Saucer
Have Yuffie join your party
Use a summon Materia in battle
Get Don Corneo to choose Cloud over the two females
Have your whole party fall in battle
Use a Limit Break
Emerge victorious from your first battle