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In this paper we study the longtime dynamics of mild solutions to retardedstochastic evolution systems driven by a Hilbert-valued Brownian motion. As apreparation for this purpose we have to show the existence and uniqueness of acocycle solution of such an equation. We do not assume that the noise is givenin additive form or that it is a very simple multiplicative noise. However, weneed some smoothing property for the coefficient in front of the noise. Themain idea of this paper consists of expressing the stochastic integral in termsof non-stochastic integrals and the noisy path by using an integration byparts. This latter term causes that in a first moment only a local mildsolution can be obtained, since in order to apply the Banach fixed pointtheorem it is crucial to have the H\"older norm of the noisy path to besufficiently small. Later, by using appropriate stopping times, we shall derivethe existence and uniqueness of a global mild solution. Furthermore, theasymptotic behavior is investigated by using the {\it Random Dynamical Systemstheory}. In particular, we shall show that the global mild solution generates arandom dynamical system that, under an appropriate smallness condition for thetime lag, have associated a random attractor.

Pathwise solutions and attractors for retarded SPDEs with time smooth diffusion coefficients