Tasks you're talking about are copypasted from Dragon Age: Bears randomly spawned sidequests objectives. If you played DA3 for example there was a certain sidemission where you needed to free 3 slaves - these slaves appeared in randomly spawned red templar camps but you never knew where it'll happen so basically you had to grind over the whole huge map till you stumble upon them. A walkthrough or helping someone over forums is impossible in this case - the objectives in your game never appear at same spots as in another player's game.
This type of quest design is one of the most horrible ideas in an openworld I've seen in my life. Neither Dragon Age nor Mass Effect are roguelikes, at least aren't advertised as such and apart from these few specific sidemissions, no other main or side mission has an objective spawned at some random spot so a player needs to go "pixelhunting".
Anyway, because objectives spawn on random locations, it's not possible to have a map marker to them.
Here's hope devs will understand that grinding through a whole map just to complete a task is annoying and boring, will make spawn spots fixed instead of random or will remove these horrible tasks completely from the game.
