Find 1-UP in Red Switch Palace

Activate Red Switch in Red Switch Palace

Beat Isle of Yoshi 2 while riding Yoshi

Beat #1 Spinjump Castle as Small Mario only (no checkpoint)

Collect all Yoshi Coins in World 1 (see comment)

Perform 5x 1-UP Combo in Isle of Yoshi 3

Beat Granite Cavern 1 [normal exit] as Small Mario only (no checkpoint, no Yoshi)

Find both 1-UPs in Granite Cavern 1

Earn 20-UPs in Yellow Switch Palace (see comment)

Collect all Yoshi Coins in World 2 (see comment)

Activate Yellow Switch in Yellow Switch Palace

Beat Granite Cavern 2 as Small Mario only (no checkpoint, no Yoshi)

You choose wrong door

Find 1-UP in Granite Cavern 3

Beat Granite Cavern 3 as Small Mario without activating Light (no checkpoint)

Beat #2 Bullet Castle as Small Mario only (no checkpoint)

Collect all Yoshi Coins in World 3 (see comment)

Collect all Yoshi Coins in Weird World (see comment)

Collect 100 Coins in Blue Switch Palace

Activate Blue Switch in Blue Switch Palace

Collect Both Moons in Graham Peak (see comment)

Find 1-UP in Graham Peak 1

Beat Graham Peak 1 while riding Yoshi

Collect the Moon in ON OFF Shenanigans

Activate Green Switch in Green Switch Palace

Beat #3 Grinder Castle as Small Mario only (no checkpoint, no Yoshi)

Beat The Silly Thicket while riding Yoshi

Beat Bowser's Front Door

Complete #1 Spinjump Castle

Complete #2 Bullet Castle

Complete #3 Grinder Castle