http://www.coh2.org/topic/17651/uses-for-unloved-units-4-45mm-atg
http://www.coh2.org/topic/14441/uses-for-mechanised-groups
http://www.coh2.org/topic/15471/uses-for-stug-es
http://www.coh2.org/topic/16469/uses-for-unloved-units-3-the-dishka
http://www.coh2.org/topic/28920/uses-for-unloved-units-end-year-update
Currently the rarest achievements:
.5%
1) Kill 5 Tigers with 45mm AT Guns
2) Deploy 50 Mech Assault Groups and 50 Mech Grenadier Groups
3) Deploy 200 Ostruppen
4) Deploy 50 Partsian SMGs, 50 Rifles and 50 LMGs
.6%
5) Kill 50 LEIG 18 crew members with ML20s
6) Destroy 20 vehicles with Dishkas
7) Destroy 100 vehicles with B4 howitzers
8) Kill 20 Vehicles with Partisan Tank Hunters
9) Get 3 Vet levels with 40 M3s
There are then a bunch at .7%
This was the Top 10 as of end last year:
1) Deploy 50 Mech Assault Groups and 50 Mech Grenadier Groups
2) Kill 5 Tigers with 45mm AT Guns
3) Deploy 50 Partsian SMGs, 50 Rifles and 50 LMGs
.4%
4) Deploy 200 Ostruppen
5) Kill 20 Vehicles with Partisan Tank Hunters
6) Destroy 100 vehicles with B4 howitzers
7) Destroy 20 vehicles with Dishkas
.5%
8) Kill 50 LEIG 18 crew members with ML20s
9) Destroy 40 light vehicles with SU-76s, and get 3 Vet levels with 20 SU-76
10) Destroy 25 222s with 81mm mortars
11) Get 3 Vet levels with 40 M3s
+++++++++++++++++++++
Deploying 50 types of each Partisan will at some point become the rarest as it is no impossible to get that
The other extinct achievement:
Defending the Motherland
Kill 100 infantry units with Soviet Irregulars
Is all the way up at .9%
I am mildly surprised that the Partisan Tank Hunters hasn't climbed more, given that they are really good now and available in two commanders one of which is Common