1-10 - Kill mobs outside city
11-16 - Kill mobs inside open dungeon east of LL
17-20 - Kill jelly fish inside cave south of Camp Bloodshore
21-33/34 - without PL gonna take a while but Guild Leve
34/35-40 - Lv35 Company Leve - dump the protect the NPC ones and just concentrate on the ones where you kill enough mobs in 15minutes, or if you have high rank GC then take the one where you have to locate the 4 mobs and repeat for quick EXP reward while getting GC seals.
41-50 - Guild Leve, Behest, Company Leve (same method as above)