You can get this during normal play by ramming and destroying any tank/TD/artillery that is at least one tier higher than you. Some tanks are better than others at ramming but generally you will have more success with tanks that are reasonably fast but also heavy (for their tier).
Here is an example of how to go about it:
It's possible to do this in any tank if you ram the right enemy but it's generally not a good idea to ram heavy tanks (unless you're in an even heavier tank) and best to go for anything else (light, medium, TD or artillery but the lighter the better). Some examples of good ramming tanks at lower tiers are:
Pz. II or III (most variants)