Here is the full list of all 42 Grass Cutter achievements.
Scare the birds 50 times.
Scare the cats 15 times
Scare the dogs 20 times
Cut 1000 squares with grass
Set the record time 25 times
Talk to the President
Complete the story company
Find all the secret doors
Complete all the secret levels
Earn 300 points in Master Pack game mode
Earn 500 points in Master Pack game mode
Earn 1000 points in Master Pack game mode
Disable 50 monsters
Use freeze time 15 times
Use a bomb.
Dive into the water 20 times
Take a mud bath 20 times
Drive by 10 times on the sand
Jump off a cliff
Open the secret level from the future for the first time
Enter the country of sweets for the first time
Visit an island paradise at the gates of paradise for the first time
25 times, purchase 15% of the energy
Face the monsters 50 times
Gather up energy when there is less than 5% left
Earn the maximum level for the assistant
Who cares about the barriers, I'm driving where I want. Break 100 barriers
Achieve the maximum rank
Immerse the first box
Get the first reward
Get wet in the rain
Kill several enemies in less than 1 second
Complete The Boss Level
Unlock All Weapons
Unlock Maximum Level HP
Unlock Maximum Energy Level
Destroy a Quadcopter
Destroy a Robot