For Final Fantasy XI - I dare you to do the following...
65. Get past the dunes.
66. Level at least 1 job to 99.
67. Gain access to every job class.
68. Play more then 30 days!
Lol, these are a joke

You should add:
Complete every expansion and add-on
Get all Artifact armor
Get all Relic armor
Get all Empyrean armor.
Make a relic weapon
Make a mythic weapon

Even these aren't really hard, just a bit time consuming. I was working on an amanomurakumo when i quit