Here is the full list of all 17 Valley Dash achievements.
As Valley, reach Dashes 25 without buying Strength or Defense upgrades
As Adam, recruit two bandits
Fill your inventory with Nasty Durians
Clear a wave of five monsters without killing any of them
Become invisible
Go back in time. Or forward? Or parallel? Or perpindicular? I'm not sure. But Great Scott it's heavy!
As Raye, respawn three times in a single game
Clear fifteen consecutive waves using only Glink to deal the final blow on monsters
Lose a robot hero to a Water Spirit's waterspit attack
Revive a fallen ally in the rudest manner possible.
Think that a real chest was a mimic
Recruit ten unique heroes in a single game
Have Valley, Bik, and Maxwell in your party at the same time
Wipe out an entire wave of five monsters with an avocado
Unleash your inner "Caveman Grog." Ooga Booga!
Buy everything at a shop
Fill every entry in your bestiary