Acquire the Varia Suit before getting the High Jump and any Beam besides regular or Ice on Normal or Hard difficulty

Aqcuire the Screw Attack before getting the Speed Booster and defeating Ridley on Normal or Hard difficulty

Collect your first Super Missile in Crateria before unlocking your full potential on Normal or Hard difficulty

Visit the Chozo locator statue in the upper right corner of Brinstar before entering Norfair on Normal or Hard difficulty

Clear the stealth section of Chozodia from beginning to end without being spotted on Hard difficulty (first two space pirates after first save room don't count, hide and let alarm end in room after before proceeding)

Unlock Time Attack Mode

Escape Chozodia with at least 1 minute and 55 seconds remaining on Hard difficulty

Obtain the Morph Ball ability

Upgrade the length of your beam

Obtain Missiles

Obtain the ability to charge your beam

Increase your Energy capacity

Obtain the ability to place bombs while morphed

Download the map data for Brinstar

Obtain an Unknown Item

Obtain the Power Grip

Obtain the Ice Beam

Defeat Mua without taking damage on any difficulty

Download the map data for Kraid's Lair

Obtain the second Unknown Item

Obtain the Speed Booster

Defeat Kraid without taking damage on any difficulty

Obtain the Hi-Jump Boots

Obtain the Varia Suit

Download the map data for Norfair

Obtain the Wave Beam

Defeat Kiru Giru without taking damage on any difficulty

Obtain Super Missiles

Defeat Imago without taking damage on any difficulty

Download the map data for Ridley's Lair

Defeat Ridley without taking damage on any difficulty

Obtain the third Unknown Item

Obtain the Screw Attack

Download the map data for Chozodia

Defeat Mother Brain without taking damage on any difficulty (see embedded photo on comments page for more details)

Escape planet Zebes with at least 20 seconds remaining on Hard difficulty

Complete the Ruins Test without taking damage on any difficulty

Obtain your fully powered suit

Obtain Power Bombs

Defeat Mecha-Ridley without taking damage on any difficulty

Escape Chozodia with at least 1 minute remaining on Hard difficulty

Complete the mission with all items collected on Normal or Hard difficulty

Complete the mission with all items collected on Hard difficulty

Complete the mission with all items collected under 2 hours on Normal or Hard

Complete the mission with all items collected under 2 hours on Hard difficulty

Complete the mission on any difficulty

Complete the mission in less than 2 hours on any difficulty

Complete the mission with 15 percent or fewer items collected on Normal or Hard

Complete the mission with 15 percent or fewer items collected on Hard

Defeat Mua without taking damage on Hard difficulty

Defeat Kraid without taking damage on Hard difficulty

Defeat Imago without taking damage on Hard difficulty

Defeat Ridley without taking damage on Hard difficulty

Defeat Mother Brain without taking damage on Hard difficulty

Defeat Mecha-Ridley without taking damage on Hard difficulty