its the final countdown glitch = solution

[melodicmizery]

so after completing all main missions on the base game, the final countdown trophy didnt pop (suppose to pop for completing all main missions)

i had gone through the dlc island and after completing almost the last mission, the trophy popped. i had previously stepped on the dlc island and did one mission on accident before the main game was done. im not sure if that or having the dlc bought had bugged this, but yah anyways theres the solution for anyone who needs it