Achievements

Defeat Mega Satan as The Forgotten

Earn all Hard Mode Completion Marks as The Forgotten

Defeat Delirium as The Forgotten

Defeat Ultra Greedier as The Forgotten

Defeat Ultra Greed as The Forgotten

Defeat Hush as The Forgotten

Complete the Boss Rush as The Forgotten

Defeat The Lamb as The Forgotten

Defeat ??? as The Forgotten

Defeat Satan as The Forgotten

Defeat Isaac as The Forgotten

Defeat Mom's Heart or It Lives! on hard modeas The Forgotten

It's complicated

It's complicated

Use I - The Magician or Telepathy for Dummies while already having homing tears (Sources of this effect include I - The Magician, Telepathy for Dummies, Spoon Bender, Sacred Heart, or Godhead).

Have 20 blue flies at the same time

Spawn three charmed enemies in the same room

Use 5 Gulp! pills in one run

Sleep in 10 beds

Die to your own explosion from Ipecac, Bob's Rotten Head, or Horf! pill

Take 50 devil deals

Acquire Rubber Cement 5 times

Have The Battery, 9 Volt, and Car Battery in your collection

Take 25 items from Angel rooms

Enter every shop from Chapter 1 through Chapter 3 in one run

Collect 10 "tears up" items or pills in one run

Acquire Blood Clot 10 times

Take 25 devil deals

Blow up doors and secret room walls 50 times

Beat Chapter 4 without taking damage

Defeat an Angel 10 times

Defeat all 5 Harbingers

Open 20 locked chests

Acquire both key pieces

Pick up two technology items in one run

Beat Chapter 3 without taking damage

Pick up any 3 of the following items/trinkets in a single run: 9 Volt, The Battery, Car Battery, AAA Battery, Watch Battery

Use Pandora's Box in the Dark Room

Beat Chapter 2 without taking damage

Purchase from shops 50 times

Have both the Broken Watch and the Stop Watch in your collection

Use cards and runes 20 times

Increase in size 5 times in a single run. Sources of increased size include "One Makes you Larger" pills, XI - Strength, and Magic Mushroom

Complete 2 Victory Laps and start a 3rd

Sleep in a bed

Recharge using batteries 20 times

Defeat Delirium for the 1st time

Defeat Little Horn 20 times

Pick up 5 familiars in a single run

Complete 7 (30 on console) daily challenges(by touching the trophy at the end)