The The Proving Grounds Add-on for Guacamelee! 2 has 7 achievements.
Complete the Snakes in the Grass Challenge without taking damage
Visit the Mother Superior in Isla Bonita as Salvador
Wake up Tiempochtli
Achieve a Silver Medal for all of Tiempochtli’s Challenges
Achieve a Bronze Medal for all of Tiempochtli’s Challenges
Kill 20 Exploders using Wall Fly while completing the Exploder Elimination Challenge
Grab and Throw 50 Enemies as Coscorrona in the Snake Temple