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