100% Completion

100% Completion refers to having mastered all aspects of a title. The Permanently Missable Items Article is useful to those undertaking this challenge. Like the Three Heart Challenge, and Speed Runs 100% Completions are an optional challenge for The Legend of Zelda series fans.

To brag of having a 100% Completed file, one must have all Heart Containers, Weapon upgrades, Items, and Collectible items such as Ship Parts. Unlike the Metroid Series, the Legend of Zelda series thus far has no in-game rewards such as alternative or lengthened endings for the feat. Although finding every last collectible is difficult in its own rights, doing so makes gameplay easier than Speedruns, Minimal Completions, and Three Hearts Challenges.

The Legend of Zelda (Game)
Most Difficult Aspect- Beating the game Checklist
 * 16 Heart Containers
 * Bomb Capacity Upgrades
 * Boomerang upgraded
 * White Sword obtained
 * Arrows upgraded to Silver Arrows
 * Blue and Red Rings obtained
 * Shield upgraded to Larger Shield
 * All Dungeon Items Obtained
 * Complete both Quests

The Adventure of Link
Most Difficult Aspect- Beating the game Checklist
 * All heart containers
 * All magic upgrades
 * Level 9 life
 * Level 9 magic
 * Level 9 attack
 * All 1-up dolls
 * All spells
 * Upward and downward stab attacks

A Link to the Past
Most Difficult Aspect- Beating the game Checklist
 * All Pieces of Heart found
 * All four bottles obtained
 * All items obtained
 * Red boomerang obtained
 * Master Sword tempered to level 3
 * Red Mail obtained
 * Magic Meter halved

Gameboy Advance remake (The Gameboy Advance remake included several new features, extending the checklist.)
 * Four Swords completed
 * Palace of the Four Sword completed
 * Lumberjack sidequest completed

Link's Awakening
Most Difficult Aspect- This is a matter of personal opinion. Checklist
 * All pieces of heart found
 * Trading Sequence completed (culminating with the Boomerang)
 * Sword upgraded to level 2 (Seashell Sword)
 * Magic Powder carrying capacity upgraded to 40 units
 * Bomb carrying capacity upgraded to 60 units
 * Arrow carrying capacity upgraded to 60 units

The Minish Cap
Checklist
 * 100 Kinstone fusions (and Kinstone Bag converted to Tingle Trophy)
 * 44 Pieces of Heart found
 * Full heart container found
 * All 4 bottles obtained (requires completion of Goron Sidequest)
 * All 8 golden monsters defeated
 * All 136 figurines obtained
 * Magical Boomerang obtained
 * Mirror Shield obtained (requires completion of Goron Sidequest)
 * Bomb carrying capacity upgraded
 * Remote bombs
 * Arrow carrying capacity upgraded
 * Light Arrows
 * All 8 Tiger Scrolls obtained
 * All 4 Sword Technique upgrades obtained
 * Wallet capacity upgraded to 999 rupees
 * Homes found for 2 of Din, Nayru and Farore
 * All 3 Joy Butterflies found
 * All 8 Swordsman Newsletters
 * All 6 colours of Picolyte made available