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