Maybe im just a masochist, but im just not a fan of being able to completely comp your account in 2 days or less.
The only real hard achievements (time wise) are the 200m requirements, but even that is completable in a day or two.
iirc
Flexicution was able to get 2 200m stats within 2 days of the server launching.
Ive always been a fan of the weird achievement that runescape had to offer, and seeing them included in comp cape on real rs is quite enjoyable.
Some examples would be champion scrolls, minigame rewards (gold cwars or the mob armies sets) or various other minigame related achievements
I get that its a private server and its meant to be fast paced and easily achieveable, but some long term achievements that arnt just xp related would be really interesting
I would like to state that the bold highlighted text are Trimmed completionist requirements
Other than that, I agree with the opinions that state removing PvP and replacing them with PvM & Ironman unique requirements.