I know of no toilet in this universe that will actually flush “up”. But I think I know what you mean.
You are likely referring toilets with pump assistance. This is what I’m familiar with. Zohler, for one, makes sewage ejector pumps and toilet/pump combo units that require no excavation to install. (There is a French company, expensive, and I wont even mention their name).
Here’s a link to Zohler and one solution:
http://www.zoeller.com/zcopump/products/homeimprove/qwikjon.HTM