The team won their island title in 1989, and the tenth club to claim the first national title in 2010 and is their only one.[1] Their first three championship finals participation ended with a loss, first to Inter Bom-Bom,[2] then to Bairros Unidos a year later.[3] At the 2007 national semis, they lost to Vitória 4–3 on May 12.[4] On March 6, 2010, Sundy challenged against 6 de Setembro in the national final for the title. In the 11th minute of the second half, Sundy scored 1–3 including a penalty.[5][6][7]
In regional championship totals, the club title was shared with Os Operários in 1990 up to 1993 when Sundy's totals became second, then third after Porto Real won their second title in 1999. Sundy's champ title totals was shared again with Porto Real with two in 2001 and then Os Operários in 2002 with the most with three, Sundy's title total became second in 2004 and lasted until 2009 when it was shared with Os Operários again as the most titles claimed, that number was later shared with Porto Real in 2014 and Sporting Príncipe for a season in 2016. Along with Porto Real's and Sporting's, its total became second behind Os Operários's five totals in September 2017.
Also Sundy won their first cup title in 2001 and their recent in 2013 totaling 4. Sundy's first appearance at the reformatted cup final was in 2001 where they lost to Vitória FC (Riboque) 4–3, later they lost to the same club in 2007 and in 2011 with the score 4–1, their last was in 2013 which was also unsuccessful, they lost to UDRA from the south of São Tomé 5–1.
