Multi tag an object

is there a way to have one object with 2 tags?

like for instance player and finish on my fps player

no you should either create a new component for this reason or just use new tags like PlayerFinish.

Your best bet might be to try out the Antares Project by Neodrop and his team. It features multitags.

I found a way in another answer, but I don't remember the link, so I re-post it to you!

You just have to create two empty objects and make them children of your FPS character, so you can tag each child and access them, using the parent attribute to get the FPS character itself!

http://forum.unity3d.com/threads/tag-frenzy-multiple-tags-per-game-object-in-unity.213029/
This might be what you’re looking for!