Here is the full list of all 22 DuelVox achievements.
Collect the first star
Visit the store
Detonate a bomb
Hit the target
Buy something at the store
Take training
Enter the game
Shoot a bird
Smash a piggy bank
Kill the enemy
Collect all the stars
Accumulate 1000 coins
Kill the cowboy in gray
Complete Bonus Level
Set the graphics to low
To die
Complete the level almost dying
Complete the last level
Complete Level One
Complete half the game
Quit the game
Spend all ammo