Metroid Prime 2: Echoes/Pickup and Key locations

There are 100 pickups and keys in the game, each of which contributes 1% to your percent items shown in the pause screen and with the save name when you select a game to continue. The breakdown is:
 * 21 Upgrades
 * 18 Required
 * 3 Optional
 * 75 Expansions
 * 14 Energy Tanks
 * 49 Missile Expansions
 * 4 Beam Ammo Expansions
 * 8 Power Bomb Expansions
 * 4 Translator Modules