Here is the full list of all 20 Blackjack of Strip achievements.
Unlock a standard deck of cards
Unlock a deck of cards with nude girls
Unlock Mrs santa
Strip the enemy 50 times in a multiplayer game
Unlock armor
Unlock a deck of cards with mystical girls
Unlock Takashi
Strip the enemy 5 times in a multiplayer game
Unlock Yumi
Strip the enemy 25 times in a multiplayer game
Unlock Dragon
Win in a single player game 10 times
Unlock Snow Maiden
Strip the enemy 10 times in a multiplayer game
Unlock Santa
Win in a single player game 5 times
Strip the enemy 1 time in a multiplayer game
Win in a single player game
Read the rules in Russian
Read the rules in English