Here is the full list of all 28 Himno - there are The Silent Melody achievements.
Craft 500 items.
Destroy 250 machines.
Destroy 50 machine elites.
Kill 150 creatures.
Deal 20000 damage.
Do 3000 jumps.
Do 1500 Dashes.
Visit 100 districts.
Light 200 torches.
Open 75 closed chests.
Destroy 1000 natural resources.
Use 150 potions.
Use weapons or equipment 10000 times.
Block 1000 bullets with shields, equipment or runes.
Receive 600 damage.
Upgrade weapons or equipment 50 times.
Reforge weapons 75 times.
Recycle 300 items.
Die for the first time.
Defeat Solace.
Defeat Mother Worm.
Defeat Tera.
Release your first Wisp Staff.
Open a golden door with Aethereal wisp.
Visit the camp for the first time.
Fall into the water for the first time.
Visit an outpost district.
Visit Farlands for the first time.