Since the other guide is inaccurate due to updates...
For this achievement - you will need to research and own these 3 Soviet tanks.
The KV-1 and KV-1S are Tier V and the KV-2 is Tier 6.
Research line is:
MS-1 -> T-26 -> T-46 -> T-28 -> KV-1.
From KV-1 you can research both KV-1S and KV-2.