Here is the full list of all 28 Timbertales achievements.
Use any skill once
Use five skills
Use twenty skills
Use fifty skills
Use two hundred skills
Use five hundred skills
Gather one sphere
Gather five spheres
Gather twenty spheres
Gather fifty spheres
Gather two hundred spheres
Gather five hundred spheres
Deal 100 damage
Deal 2000 damage
Deal 5000 damage
Deal 10000 damage
Complete one mission challenge
Make a combo attack
Kill two units in one round
Solve the tutorial missions
Solve the prolog missions
Solve the sylvan campaign
Complete all sylvan mission challenges
Pause a unit
Toggle through units
Unlock the challenge mode
Unlock the arena
Visit the credits