Unlock the following alternate costumes by performing the corresponding tasks:

COSTUME - HOW TO UNLOCK
Amanda (ritual) - Complete the Ghana Time Trial.
Amanda (winter) - Complete the Kazhkastan Time Trial.
Biker - Complete England - King Arthur's Tomb.
Biker (no jacket) - Collect all Silver and Gold rewards in England.
Biker (red jacket) - Collect all Silver rewards in England.
Bikini (black) - Complete the game, all Time Trials, and collect all Bronze, Silver, and Gold rewards in all levels, including Croft Manor.
Bikini (white) - Complete the game and all Time Trials.
Catsuit - Collect all Gold rewards in Japan.
Classic (gray) - Collect all Gold rewards in Ghana.
Classic - Collect all Gold rewards in Peru.
Evening Dress (red) - Collect all Silver rewards in Japan.
Evening Dress (ripped) - Complete Japan - Meeting With Takamoto.
Goth - Complete the England Time Trial.
Goth (lace shirt) - Complete the Japan Time Trial.
Legend (black) - Collect all Silver rewards in Croft Manor.
Legend (blue) - Collect all Silver rewards in Peru.
Legend (pink) - Collect all Silver rewards in Ghana.
Legend (Union Jack) - Collect all Silver rewards in Bolivia.
Snowsuit - Collect all Gold rewards in Nepal.
Special Forces (urban) - Collect all Gold rewards in England.
Special Forces - Collect all Gold rewards in Kazakhstan.
Sport - Collect all Gold rewards in Bolivia.
Sport (green) - Complete the Bolivia Time Trial.
Suit (cream) - Collect all Silver and Gold rewards in Croft Manor.
Winter (no coat) - Complete Kazakhstan - Project Carbonek.
Winter (no coat, pink) - Complete the Peru Time Trial.
Winter (no coat, orange) - Collect all Silver rewards in Kazakhstan.
Winter (pink) - Complete the Nepal Time Trial.
Winter (orange) - Collect all Silver rewards in Nepal.
Winter - Complete Kazakhstan - Project Carbonek.