Here is the full list of all 28 Katy and Bob Way Back Home achievements.
All levels with all tasks completed
Airship location completed
All levels completed as Expert
All artifacts in antique shop purchased
2000 customers served
300 glasses of juice prepared
40 levels with all tasks completed
Fireworks launched 150 times
Lighthouse location completed
40 levels completed as Expert
500 cocktails made
250 monkeys served
1000 customers served
Fireworks launched 100 times
50000 in tips collected
150 glasses of juice prepared
250 cocktails made
100 monkeys served
Beach bar location completed
20 levels completed as Expert
20 levels with all tasks completed
Fireworks launched 50 times
25 monkeys served
50 glasses of juice prepared
10000 in tips collected
50 cocktails made
100 customers served
1000 in tips collected