The way I think about it is:

If the action is a deceleration (eg catching a ball in front of you and slowing it down by bringing your arms back towards you, or slowing your leg down after kicking a football) then it is eccentric.

If the action is controlled against gravity then it is eccentric (eg sitting down on a chair is an eccentric contraction of the knee extensors, or starting stood on tip toes and lowering down slowly to a flat foot will be eccentric contraction of ankle plantarflexors).

Anything else is concentric. If you are exerting a big force eg kicking a ball then it's concentric.