Power On Games

Plenty of games reward you with bits of unlockable art, but there are few that do it with Mafia 2′s scintillating period style. Completing Chapters on Normal difficulty unlocks posters and paintings that depict the characters you’ll come to love in a variety of gun- and cigarette-smoke-filled environs. Kick it up to Hard difficulty, and you’ll be treated to a bevy of buxom broads, all wearing devilishly complicated 50′s lingerie — pinups, as they’re colloquially called.
The order in which these artistic goodies unlock is a little opaque, so take a look at the list below to make collecting them all a piece of cake.
Chapter 2

• Normal Difficulty – Posters 1 and 2
• Hard Difficulty – Pinup 1 (Mechanic)

Chapter 3

• Normal Difficulty – Painting 1
• Hard Difficulty – Pinup 2 (Safecracker)

Chapter 4

• Normal Difficulty – Poster 3
  Hard Difficulty – Pinup 3 (Sexy Santa)
  

Chapter 5

• Normal Difficulty – Painting 2
• Hard Difficulty – Pinup 4 (Machine Gunner)

Chapter 6

• Normal Difficulty – Poster 4
• Hard Difficulty – Pinup 5 (Jailbait)

Chapter 7

• Normal Difficulty – Painting 3
• Hard Difficulty – Pinup 6 (In the Trunk)

Chapter 8

• Normal Difficulty – Poster 5
• Hard Difficulty – Pinup 7 (Arsenal and Lace)

Chapter 9

• Normal Difficulty – Painting 4
• Hard Difficulty – Pinup 8 (Hail of Bullets)

Chapter 10

• Normal Difficulty – Painting 5
• Hard Difficulty – Pinup 9 (Dy-no-mite)

Chapter 11

• Normal Difficulty – Poster 6
• Hard Difficulty – Pinup 10 (Hostage)

Chapter 12

• Normal Difficulty – Poster 7
• Hard Difficulty – Pinup 11 (Ice Cream)

Chapter 13

• Normal Difficulty – Posters 8, Painting 6
• Hard Difficulty – Pinup 12 (Shower Shadow)

Chapter 14

• Normal Difficulty – Poster 9, Painting 7
• Hard Difficulty – Pinup 13 (Smoking Gun)

Chapter 15

• Normal Difficulty – Poster 10, Painting 8
• Hard Difficulty – Pinup 14 (Hair Dryer)