Games

This is my rarest but it's a small part that nobody plays of a niche game.

0.2% - American Truck Simulator

Shining Star
Obtain 3 stars in any 3 scenarios played in a row in Truck Driving Proficiency (Driving Academy)

The one I'm proud of:

0.3% - Halo: Master Chief Collection

A Preference for Pain
Halo 3: Complete the Halo 3 LASO Campaign playlist.

Factorio Express Delivery was quite an effort and a lot of fun.

I also have some fun Europa Universalis 4 achievements that were at 0.1% when I got them, but it seems that I need to up my game there :P

There’s a lot of achievements on this game that barely anyone has

Rarest: Some random achievement in City Skylines that I didn’t even notice I got

Proudest: Embrace the Void and 112% in Hollow Knight

Not extremely rare but this achievement almost me rage-quit.

Red Orchestra 2

0.3%

Silent Killer

Get 32 Kills with the silenced Nagant Revolver

Man what an awesome game, I miss it

My two rarest achievements are for playing the objective in certain Lawbreakers gamemodes. I imagine these weren't intended to be ultra-rare but fate had other plans.

There are now third party servers to play on but they can't unlock steam achievements

The cactus simulator one. That was a lot of standing.

Most are DLC specific or from old games.

new one from an update in March, so will probably drift down the list:

long-term rarest:

all my remaining rarest ones are from Civ 5, I guess most players don't have the DLC

Two of my rarest: Dune Awakening

Dispatch

My overall showcase

And probably my proudest accomplishment

This one is the rarest of the game

This one is less rare but actually more difficult. Far more people attempt it so it has a higher achievement rate.

This one, and the same achivement on American Truck Simulator.

My sibling, why would you ever play witch it on an official server?