Time: 4/6/2016-4/7/2016 all night
Frequency: Every time
World name: Coeurl
Character name: Kinedel Manedel
Class/Level: PLD 60
Party or solo: Party
Area and coordinates: "Alexander - Fist of the Son" and "Alexander - Burden of the Son" (likely all 4 ___ of the Son raids, but I didn't run the other two as much tonight)
Steps:
1. View progress towards Dungeon master.
2. Complete one of the Midas raids.
3. Notice that no progress was made towards Dungeon master even though progress is made towards "A Tankless Job"

Taking a second look at this now, if this is by design (raids don't count towards this achievement?), then the wording is perhaps strange:

"Complete 1,000 instanced dungeon raids or trials."

Would probably be more clear as:

"Complete 1,000 instanced dungeons or trials."

Since the way it currently reads can easily be misread as:

"Complete 1,000 instanced dungeons, raids or trials."