If you have any questions or suggestions for this, please Tweet them to @HutchensRS or pm Hutchens in-game.

(If one, standard comp cape comes out these lists should just be added together)

Standard:

Achieve level 99 in all skills

Complete all Achievement Diaries (All quests included)

Unlock all songs

Fully explore the Stronghold of Security

Complete all miniquests

Unlock all 3 mage arena spells

Unlock the Teleport to Bounty Target spell

Unlock the Kourend Teleport spell

Unlock Ourania teleport

Unlock the Preserve prayer

Unlock Rigour

Unlock Augury

Unlock all Kudos

Complete Mage Arena II

Trim:

Find all barbarian notes in the Ancient cavern

Find all Champion scrolls

Unlock Ali Morrisane's highest rune shop

Unlock all Eagle Transport routes

Kill 4,000 Chompy birds

Unlock all Hot Air balloon routes

Unlock the ability to craft all slayer items

Obtain an Overseer's book (0/3 Bludgeon pieces)

Legend clue scroll rank in observatory 2k clues completed

Complete 500 easy clues

Complete 400 medium clues

Complete 300 hard clues

Complete 200 elite clues

Unlock all emotes

Toggle all warning screens

Unlock all death respawn locations

Unlock Motherlode Mine expansion

Use Serum 208 on Razmire and Ulsquire Shauncy

Add all Fairy Ring codes to travel log

Fill all god books

Activate Saradomin's Light

Kill Tarn Razorlor and enchanted a salve amulet

Unlock Uglug Nar's shop

Unlock the Contraband Yak Produce store in Jatizso

Unlock the Blood and Soul rifts in the Abyss

Deliver GWD letter

Decrease price of crystal equipment

Ask Lanthus to use Ava's accumulator in Castle Wars

Build all STASH units

Unlock all minecart locations on Zeah

Pay a one-time fee for Zeah minecart rides

Unblock all Kourend Catacomb entrances

Return Mistag's brooch

Kill 1 of each PoH topiary/jar display boss

Unlock superior slayer encounters

Purchase an Ancient staff from Eblis

Unlock the Quidamortem shortcut

Use an Ancient Tablet on Xeric's talisman

Unlock the ability to purchase Bologa's blessing

Use the Diary of Herbi Flax on the apothecary

Unlock all slayer finishing moves

Unlock 'Duly noted'

Obtain extra XP from the Information Clerk in the Varrock Museum

Obtain XP lamps from Historian Minas

Set Droalak's spirit free

Unlock more sack capacity from Prospector Percy

Purchase Auto-weed from Tithe Farm

Unlock free travel to Dragontooth Island

Advise Ali the Barman his beer is poisoned

Put Klenter's soul to rest

Empty the crates in Goblin Village

Ask your cat to tell you about The Devourer

Obtain gems from the demon's throne in Uzer

Unlock Banisoch's dungeon for 5k Trading sticks

Advise Litara of her brother's death

Complete the Inferno

Discover Veos' client name

Steal coin from the chest in Icthlarin's pyramid

Pay Baraek to reveal the location of the Phoenix gang HQ

Pay the street urchin in Pollnivneach to distract another villager

Claim XP from Duke

Speak to Observatory assistant after the Observatory quest

Unlock access to the Fishing Platform

Rebuild the expedition camp

Unlock all Magic Mushtrees

Finish the Fossil Island note book

Unlock the Slayer Tower roof entrance

Complete Kharedst's memoirs

(The below list is of requirements that should be made one-time unlockables. Once you get them, you should show it to an NPC that relates to the item/set and it'll tick off the comp list.)

List of items and correlative NPCs: http://pastebin.com/r2B0XZnC

Find all taxidermy trophies

Purchase all wearable Trouble Brewing rewards

Purchase a set of white Graceful

Purchase all Void gear (Incl. Elite Void)

Find full Lumberjack from Temple Trekking

Purchase all unique Motherlode Mine rewards

Find the Angler Outfit from the Fishing Trawler

Find full Rogue outfit

Purchase all penance gear

Purchase all rewards from the Tithe Farm

Imbue all NMZ rewards

Purchase an Herb sack

Obtain a dragon defender from the Warrior's Guild

Fill the key ring

Collect an Ancient gorilla and Kruk monkey greegree

Find Flippers and a Mudskipper Hat

Obtain a magic butterfly net and jar generator

Collect all random event outfits

Collect all Clue hunter gear

Collect all runecrafting pouches

Obtain a Crab claw and Crab helmet

Obtain a Fremennik blade, helm and shield

Obtain a Flamtaer bag

Obtain a Tea flask

Obtain Xeric's talisman

Obtain Arclight

Assemble all 4 slayer helms

Obtain full Pyromancer from the Wintertodt

Obtain a Bruma torch from the Wintertodt

Obtain a Camulet with unlimited charges

Obtain a Bolt pouch

Obtain a Skull scepter (i)

Craft an Eternal Slayer Ring

Obtain an Inferno cape

Combine both gloves from the Mining Guild

Purchase an Undead chicken

Obtain a Mage Arena II cape

***Additional/debatable requirements:

Found both Mutagens from Zulrah (0/2)