Here is the full list of all 23 Dead Simple 21 achievements.
Make 21 in any lane
Value of cards go over 21
Max out the Multiplier
Round 1 Completed
Score 150 Points
Score 300 Points
Score 500 Points
Score 750 Points
Score 1000 Points
Score 1500 Points
Score 2000 Points
Round 3 Completed
Round 5 Completed
Round 7 Completed
Round 10 Completed
Go Bust 10 Times in one round
Score 2500 Points
Make 21 Seven Times in one round
Make 21 Fifteen Times in one round
Death hates a quitter!
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5 Card Trick
Ghost Bustin'