Here is the full list of all 12 What A Trash Game achievements.
Visit the campsite
Visit all shops in one game
Visit all houses in one game
Throw 1000 rubbish items in the ocean
Visit a total of 250 houses
Throw 50 rubbish items in a drain
Find the mythical water cooler bottle
Pick up 30 chip packets in one game
Play a game without littering at all
Play a game with a friend
Litter with only mythical rubbish items
Find the litterbug!