The other solution is on the right path just explained wrong. This achievement is labeled incorrectly by the Dev's on purpose. Thats the kind of game this is. The actual solution description of this is "In a public match, get 4 sacrifices in a single match". I actually got the 4 sacrifices over 2 matches so its kind of buggy.
Moral of the story: This is a Killer achievement, not a survivor achievement. Get 4 sacrifices (all in the same match if you u can) achievement unlocked