On March 10, 2008, Guerra was honored with 6 awards in los Premios Casandra, the most important award event in the Dominican Republic. He won for Orchestrator of the year, Outstanding artist abroad, Music album of the year for "La Llave de mi Corazón" (The Key to My Heart) and "El Soberano" (The Sovereign).
On March 16, 2008, he and other artists participated in the Paz Sin Fronteras concert organized by Juanes, celebrating the end of the 2008 Andean diplomatic crisis between Colombia, Venezuela, and Ecuador.
On April 11, 2008, Guerra was the Billboard Latin awards big winner, with 7 nominations and 3 awards.
On September 15, 2008 Guerra was named a UNESCO Artist for Peace "in recognition of his efforts for the benefit of children with disabilities and children in need."
On October 17, 2008, he participated as a Goodwill Ambassador for UNESCO in an event called "Levántate y Actúa contra la Pobreza y por los Objetivos de Desarrollo del Milenio", in Bavaro, Dominican Republic, during the International Conference of the Americas. There, with over 2,500 young people across the hemisphere, he read out the Dominican Declaration Campaign, at the event organized by the "Dominican Association of the United Nations" (UNA-DR) and Global Democracy and Development Foundation (FUNGLODE), and was supported by the "Department of Public Information of the United Nations."