Marxist Veteran and Opposition leader VS Achuthanandan and CPI(M) Polit Bureau member Pinarayi Vijayan were among the candidates who filed their nominations for the May 16 Assembly polls in Kerala on Monday. Achuthanandan, CPI(M)-LDF candidate from Malampuzha constituency in Palakkad filed his papers around 1 pm; while Vijayan, who is contesting from Dharmadom, submitted his nomination at Kannur Collectorate.