Here is the full list of all 26 Must Dash Amigos achievements worth 1,000 gamerscore.
You nailed 10 opponents with a Flaming Burrito!
You won your very first Battle!
You won a Battle without getting killed once!
You got transformed into an Avocado and survived!
You won your very first Race!
You splatted your first Avocado with the Gwack-a-Mole Mallet!
You won your very first gold trophy in Time Trial Mode!
Congratulations, you launched the greatest game in the history of the universe!
Complete a Challenge for the first time in Challenge Mode
Hit 10 enemies with a Mega Burrito
Hit 10 enemies with an InvinciBull
Splat 20 Avocados with the Gwack-a-Mole Mallet
Hit 50 enemies with a Flaming Burrito
Splat 50 Avocados with the Gwack-a-Mole Mallet
Hit 100 enemies with a Flaming Burrito
Use a Speed Boost 1000 Times
Unlock all of the extra outfits for every character
Win every round of a 7-Round race
Score more than 8000 points in a single Battle
Splat 100 Avocados with the Gwack-a-Mole Mallet
Destroy 50 Piñata Stampedes
Complete every single Challenge
Get a gold trophy for every single Time Trial
Win 150 Races
Win 150 Battles
Complete a Grand Tour Tourney