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