Learn Cosmo Memory—Red XIII's last Limit Break

Learn All Creation—Yuffie's last Limit Break

Score 10,050 points or more in G-Bike at the Gold Saucer

Obtain the Bahamut ZERO Materia

Learn Final Heaven—Tifa's last Limit Break

Raise a Materia to Lv. 5

Obtain the Leviathan Materia

Have Yuffie join your party

Have your whole party fall in battle

Use a Limit Break

Read all of the Jötnar shrines

Defeat Baldur

Kill all of Odin’s Ravens