Here is the full list of all 13 Kinaman vs Gray Elephant achievements.
Start the game with a friend in Splitscreen mode.
Complete the training.
Start the game with saving.
To die for the first time.
Go through the first level without one death.
Find one secret star at the first level.
Enable cheat mode.
Finish the game completely.
Collect 10 coins at a time.
Collect 30 coins at a time.
Do not collect any coins on the first level.
Complete the game in "Time Attack" mode.
Go through the first level at twice the speed.