Here is the full list of all 32 Walk on Arrow achievements.
Kill an enemy
Finish double player mode once
Died with falling from a high place
Get 1st place in a game
Purchase a piece of clothing
Equipping Lv3 Helm and Lv3 Armor at the same time
Kill a frozen enemy
Kill an enemy in 40 meters away
Kill an enemy by pushing him out of a platform using boom arrow
Get 1st place in 2 minutes and 30 seconds
Get 1st place without doing any damage
Get second lieutenant
Play game 50 times
Break 50 jerry can
Use radar 50 times
Head shot 100 times
Loot 200 items in total
Get 10000 gold coins
Kill 20 enemies in a single match of war mode
Travel 100000 meters
Dealing 1000000 damage
Kill the bighead one in war mode match 50 times
Finish a game of guardian mode solo and keep the hit point greater than 90%
Finish a game of guardian mode with your teammate once
Kill 100 enemies with the push force of the bomb arrow
Slice an enemy off
Drown once
Equip a tail
Kill an enemy when you are flying
Slice 100 enemies off
Kill 100 enemies when you are flying
Freeze an enemy in the radiative zone and watch him/her die because of radiativity