Midnight Delver Tank

1. 
   Damage:
   
2. Midnight Delver Damage Dealer: Tier 4
3. 
   
4. Midnight Delver Damage Dealer II: Tier 8
5. 
   
6. Midnight Delver Damage Dealer III: Tier 11
7. 
   

1. 
   Healer:
   
2. Midnight Delver Healer: Tier 4
3. 
   
4. Midnight Delver Healer II: Tier 8
5. 
   
6. Midnight Delver Healer III: Tier 11
7. 
   

1. 
   Tank:
   
2. Midnight Delver Tank: Tier 4
3. 
   
4. Midnight Delver Tank II: Tier 8
5. 
   
6. Midnight Delver Tank III: Tier 11
7. 
   

To track the delve 11 achievements, use the macros below:

1. 
   
2. Midnight Delver Damage Dealer III
   /run C_ContentTracking.StartTracking(2, 61713)
3. 
   
4. Midnight Delver Healer III
   /run C_ContentTracking.StartTracking(2, 61716)
5. 
   
6. Midnight Delver Tank III
   /run C_ContentTracking.StartTracking(2, 61719)
7. 
   

So are you the Tank, Healer, Damage, or is it Valeera? As a Warlock how do I become a Tank or Healer, or am I suppose to make a couple alts, level them up and use them?
Not very clear to me.
Doesn't state achievement is account wide or warbound. But it is listed as a character achievement.
Sorry but I am just not sure.

the achievement is account wide, so you need alts to get it. And it's your role, not Valeera.