Platelets are involved in relevant physiological and pathophysiological processes such as hemostasis and tumor progression. These anucleate blood particles exert their functions essentially by releasing effector molecules such as proteins from intracellular granules and by generating and secreting specific lipids. In order to contribute to a systematic proteomics and eicosadomics analysis of platelets activated by calcium mobilization, we have investigated proteins and eicosanoids in lysates and secretomes of platelets activated with ionomycin. To this end, self-established shotgun proteomics and shotgun lipidomics platforms were used. Applying an FDR of less than 0.01 at both, peptide and protein level, a total of 2543 protein groups was identified. Several regulatory effects concerning proteins were determined, including protein secretion, degradation, as well as protein synthesis. Incorporation of 35S-methionine in platelet proteins determined by 2D-PAGE confirmed de-novo protein synthesis. Moreover, we were able to determine a complex set of eicosanoids synthesized by activated platelets, including 15S-HETE, prostaglandin E2 and pro-survival factors such as 12-HETE, as well as eicosanoids previously undescribed to have platelet functions, such as 9-HETE and 11-HETE. Proteomics data complemented the findings from lipidomics experiments and supported the generation of a map indicating pathways leading to eicosanoid production in platelets upon calcium mobilization.