The Lost Achievement, Description, Unlock & Secret Number | Binding of Isaac Wiki

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Binding of Isaac Achievement: The Lost

Achievements

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Description	Unlocked a new character.
Unlock	Removed in Afterbirth: It's complicated Added in Afterbirth: Die in a Sacrifice Room while holding Missing Poster
In-Game Secret Number	82
Platforms	All
DLC Required	None
Achievement Description

Description: Unlocked a new character.
Unlock: Complete chapter 4 for the 1st time
In-Game Secret Number: 81

Description: Unlocked a new item.
Unlock: Defeat Isaac as The Lost
In-Game Secret Number: 129

Description: Unlocked a new item. (Also unlocks the Ball of Bandages)
Unlock: Defeat Mom for the 1st time
In-Game Secret Number: 6

Description: Unlocked a new item.
Unlock: Complete challenge #3
In-Game Secret Number: 91

Description: Donated 100 pennies to the shop.
Unlock: Donate 100 coins to the Donation Machine
In-Game Secret Number: 152

Store Upgrade lv.2

Description: Unlocked another miniboss!
Unlock: Take 20 items from devil rooms
In-Game Secret Number: 142

Description: Built him out of meat cubes.
Unlock: Make a Super Meat Boy by picking up 4 Cubes of Meat in one run; see methods to create a Super Meat Boy
In-Game Secret Number: 144

Description: You became Lord of the Flies.
Unlock: Become Lord of the Flies
In-Game Secret Number: 178

Lord of the Flies

Description: Unlocked a new item.
Unlock: Visit 10 arcades
In-Game Secret Number: 26

Description: Unlocked a new item.
Unlock: Defeat Satan as Judas
In-Game Secret Number: 72

Description: Unlocked a new item.
Unlock: Complete the Boss Rush as Eve
In-Game Secret Number: 112

Description: New boss in the caves!
Unlock: Beat Chapter 2 30 times
In-Game Secret Number: 17

Description: Unlocked a new item.
Unlock: Removed in Afterbirth: Beat Mom's Heart, Isaac, Satan, ???, and The Lamb and complete the Boss Rushon hard mode as The Lost
Added in Afterbirth: Earn all 9 Completion Marks on hard mode as The Lost
In-Game Secret Number: 156

Description: Unlocked a new item.
Unlock: Complete challenge #15
In-Game Secret Number: 101

Swallowed Penny

Description: New boss in the depths!
Unlock: Beat Chapter 3 20 times
In-Game Secret Number: 18

Something Sticky

Description: Unlocked a new item.
Unlock: Complete the Boss Rush as The Lost
In-Game Secret Number: 133

Description: Unlocked a new item.
Unlock: Blow up 20 shopkeepers
In-Game Secret Number: 61

Description: Unlocked a new co-player baby.
Unlock: Defeat Mom's Heart on hard mode as Isaac
In-Game Secret Number: 167

Description: Unlocked a new item.
Unlock: Pick up any 2 of the following items in a single run: Bob's Rotten Head, Dead Cat, Cricket's Head, Tammy's Head
In-Game Secret Number: 31

Description: Unlocked a new item.
Unlock: Defeat ??? as ???
In-Game Secret Number: 113

Description: Unlocked a new item.
Unlock: Complete challenge #19
In-Game Secret Number: 62

Description: Chapter 4 - The Womb unlocked.
Unlock: Defeat Mom for the 1st time
In-Game Secret Number: 4

Description: Unlocked a new co-player baby.
Unlock: Defeat Mom's Heart on hard mode as Eve
In-Game Secret Number: 169

Description: Unlocked a new item.
Unlock: Beat Chapter 2 for the 1st time
In-Game Secret Number: 14

Description: Unlocked Challenge #11.
Unlock: Beat challenge #19 and defeat Lokii for the 1st time
In-Game Secret Number: 164

Description: Unlocked a new item.
Unlock: Defeat Isaac as Isaac
In-Game Secret Number: 106

Description: Unlocked a new item.
Unlock: Obtain three Mom items in one run
In-Game Secret Number: 35

Description: Unlocked a new item.
Unlock: Complete the Boss Rush as Azazel
In-Game Secret Number: 9

Description: Unlocked a new item.
Unlock: Defeat Satan as Eden
In-Game Secret Number: 122

Book of Secrets

Description: Unlocked a new co-player baby.
Unlock: Defeat Mom's Heart on hard mode as Judas
In-Game Secret Number: 170