Suggestion - Unique Boss fight Achievements

Some of you may know what I'm talking about, as WoW did this type of thing for their bosses, but what if we had an achievement category specifically for boss fights and handling them differently?

Here are a few of examples I can think of...
1) Defeat turn 9 with each golem dying within 5 seconds of the first ones death.
2) Defeat moogle extreme by leaving 2 moogles unharmed in the first 2 main phases.
3) Defeat the second boss of Amdapor Keep without letting the adds get a cast off.
4) Defeat turn 11 by only allowing each person to get hit by repelling cannons a maximum of two times.

Anyway, these would make the fights fun in a different way, as players do even challenge themselves in fights to 4 man them. Like the recent T9 4 man and shiva EX 4 man.

I think these would be a great addition! What do you all think?

Honestly I'd be more interested in the dungeon bosses having something to get an achievement from (during storyline and post game dungeons), rather than some of the post game raid stuff (Partally due to me not being in a raid group)