BRAINS! Achievement, Description, Unlock & Secret Number

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Description	Unlocked Challenge #27.
Unlock	Defeat Isaac 5 times
In-Game Secret Number	271
Platforms	All
DLC Required	Added in Afterbirth
Achievement Description

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Description: Unlocked Challenge #29.
Unlock: Defeat Mom for the 1st time
In-Game Secret Number: 273

Onan's Streak

Description: Unlocked Challenge #21.
Unlock: Defeat Mom for the 1st time
In-Game Secret Number: 265

XXXXXXXXL

Description: Unlocked a new item.
Unlock: Defeat Ultra Greed as Eden
In-Game Secret Number: 201

GB Bug

Description: Unlocked a new co-player baby.
Unlock: Defeat Mega Satan as Lilith
In-Game Secret Number: 216

Big Baby

Description: Unlocked a new starting item.
Unlock: Defeat Satan as Keeper
In-Game Secret Number: 237

Keeperholds Store Key

Description: Unlocked a new item.
Unlock: Defeat The Lamb as Keeper
In-Game Secret Number: 239

Karma

Description: Unlocked a new item.
Unlock: Defeat Hush as Eve
In-Game Secret Number: 184

Athame

Description: Unlocked a new item.
Unlock: Complete challenge #22
In-Game Secret Number: 225

Get out of Jail Free Card

Description: Unlocked a new co-player baby.
Unlock: Defeat Mega Satan as Magdalene
In-Game Secret Number: 206

Red Baby

Description: Unlocked a new co-player baby.
Unlock: Defeat Mega Satan as The Lost
In-Game Secret Number: 215

White Baby

Description: Unlocked a secret.
Unlock: Donate 234 coins to the Greed Machine
In-Game Secret Number: 247

Special Shopkeepers

Description: Unlocked a new item.
Unlock: Defeat Isaac as Lilith
In-Game Secret Number: 218

Rune Bag

Description: Unlocked a new item.
Unlock: Defeat The Lamb as Lilith
In-Game Secret Number: 221

Succubus

Description: Unlocked a new co-player baby.
Unlock: Earn all hard mode completion marks as Cain
In-Game Secret Number: 261

Picky Baby

Description: Unlocked a new co-player baby.
Unlock: Defeat Mega Satan as Lazarus
In-Game Secret Number: 213

Long Baby

Description: Unlocked a new co-player baby.
Unlock: Defeat Mega Satan as Azazel
In-Game Secret Number: 212

Black Baby

Description: Unlocked a new co-player baby.
Unlock: Defeat Mom's Heart on hard mode as Lilith
In-Game Secret Number: 223

Goat Head Baby

Description: Unlocked a new item.
Unlock: Defeat Hush as Azazel
In-Game Secret Number: 186

Maw of the Void

Description: Unlocked a new item.
Unlock: Complete challenge #24
In-Game Secret Number: 227

2 new pills

Description: Unlocked a new item.
Unlock: Donate 30 coins to the Greed Machine
In-Game Secret Number: 244

Wooden Nickel

Description: Unlocked a new item.
Unlock: Defeat Ultra Greed as Eve
In-Game Secret Number: 197

Black Feather

Description: Unlocked a new co-player baby.
Unlock: Earn all hard mode completion marks as Azazel
In-Game Secret Number: 259

Sucky Baby

Description: Unlocked a new item.
Unlock: Defeat Ultra Greed as Magdalene
In-Game Secret Number: 193

Censer

Description: Unlocked a new item.
Unlock: Defeat Satan as Lilith
In-Game Secret Number: 220

Serpent's Kiss

Description: Unlocked a new item.
Unlock: Complete challenge #30 (Removed in Afterbirth+ The unlock is bugged and actually unlocks Kidney Stone)
In-Game Secret Number: 233

Blank Rune