Here's a few things. If you want lists check gamefaqs
The End G.G you obtain for Oversouling all fiends in Shinra's list.
(I didn't think it was worth the effort, but anywaz.)
Iron Duke you obtain for defeating Trema at floor 100.
Invincible (I think this is the break damage limit one) You can only obtain if you viewed the Camera Lenz to Youth Leagues base in Kilika in ch1,3 & now 5 go over to it.
For the Chocobo Ranch, I really hated this place. I pretty much tried to stay along the wall towards the right and side, I'm sure you've already figured some of it out, but you have to raise all 5 walls & then the middle wall. You can find a pic of the dungeon at gamefaqs.com that might help, It did me.
Lvl 80 Boss, PURE EVIL! She will override your Ribbon, or stoneproof, there is NOTHING you can do about this. You will need softs for this fight. DO NOT WAISTE your accessory slots with Ribbon or StoneProof.
If you'll Oversoul her, she won't hit as hard, ironic but believe me, it's true!
Do this by going somewhere where these types of snakes are frequent, (for me Zanarkand rings a bell) Go and fight approx. 13, When You Get one to OVERSOUL DO NOT KILL IT! Escape/Flee, and head to Bevelle. She will be Oversouled, and easier to fight.
Break Damage limit isn't really needed. Just use Cat Nip, when in critical status to do 9999 hits.