Here is the full list of all 11 TripleBuilder achievements.
Do 3x Combo in any game mode
Get Score 100 Times in Normal Game Mode
Drive Vehicle in MyCities Mode
Enter the Vehicle in MyCities Mode
Walk in MyCities Mode
Save City in any game mode
Do 2x Combo 10 Times in any game mode
Get Score 50 TImes in Normal Game Mode
Do 2x Combo in any game mode
Get Score 10 Times in Normal Game Mode
Place Building in any mode