Here is the full list of all 37 Spirits of the Hellements - there are TD achievements.
Complete Chapter 3
Fully unseal the Cyclone Spirit
Unlock the Divine Spirit
Complete Chapter 2
Fully unseal the Forest Spirit
Fully unseal the Sniper Spirit
Fully unseal the Gatling Spirit
Fully unseal the Curse Spirit
Reach Level 20
Unlock the Laser Spirit
Fully unseal the Explosive Spirit
Acquire 5 chaos orbs
Acquire 10 chaos orbs
Reach Level 10
Complete Chapter 1
Unlock the Mushroom Spirits
Unlock the Cyclone Spirit
Unseal any Spirit upgrade
Complete Chapter 4
Complete Chapter 5
Fully unseal the Divine Spirit
Fully unseal the Mushroom Spirits
Fully unseal the Laser Spirit
Acquire 25 chaos orbs
Acquire 50 chaos orbs
Acquire 75 chaos orbs
Acquire 100 chaos orbs
Acquire 150 chaos orbs
Acquire every chaos orb
Complete Anarchy mode on any map
Complete Anarchy mode on all maps
Beat any map on Diablo difficulty
Beat a map with a Diablo modifier applied
Reach Level 30
Reach Level 40
Reach Level 50
Fully unseal every Spirit