If we cant see all the spectrum does this mean that maybe exist objects we cant perceive? or it just the colors we cant perceive?
Yes, it's possible for there to be objects which are invisible to human eyes but which would be detectable using wavelengths outside the visible range.
A simple example is index-matched beads, which become invisible when submersed in water because their refractive index for visible wavelengths matches that of water, and there is no longer refraction and reflection at the bead's surface (which is how you see them when they're in air). It is perfectly conceivable to retain this behaviour while also asking for a difference in refractive index from that of water in the ultraviolet or infrared regimes, in which case a UV or IR camera would be able to detect them.
Generally speaking, though, it would take a dedicated effort to manufacture such an object, and it would only work in limited circumstances.