Here is the full list of all 28 Tin & Kuna achievements.
Obtain every achievement in Tin & Kuna.
Collect all Energy Crystals in the game.
Finish every non-boss stage at least once without taking damage.
Beat the best time in every stage.
Beat the best time in all the World 1 stages.
Beat the best time in all the World 2 stages.
Beat the best time in all the World 3 stages.
Beat the best time in all the World 4 stages.
Beat all World 1 non-boss stages at least once without taking any damage.
Beat all World 2 non-boss stages at least once without taking any damage.
Beat all World 3 non-boss stages at least once without taking any damage.
Beat all World 4 non-boss stages at least once without taking any damage.
Collect all Energy Crystals within World 1.
Collect all Energy Crystals within World 2
Collect all Energy Crystals within World 3.
Collect all Energy Crystals within World 4.
Perform all of Kuna's moves at least once.
Without touching the ground, bounce atop a Bouncer enemy five times in a row.
Have two Bomber enemies explode together.
Roll for 42 kilometers.
Collected a total of 2500 sparks over the course of your adventure.