Here are the expansion Wilderness Missions info and hints.
Mission 1 : the two Gore'TherMission 2 : transmitter hall Mission 3 : Simon's hiding Mission 4a : antenna search route A Mission 4b : antenna search route B Mission 5a : next antenna Mission 5b : next antenna Mission 6a : batteries needed #1 Mission 6b : batteries needed #2 Mission 7 : Wayne's escape Mission 8 : on the road again Mission 9 : the Tr'Yns Mission 10a : to the fuel station #1 Mission 10b : to the fuel station #2 Mission 11a : where's the fuel ? route A Mission 11b : where's the fuel ? route B Mission 12a : fuel up Mission 12b : fuel up Mission 13 : to the jungle Mission 14a : retreat - this way Mission 14b : retreat - the other way Mission 15a : back in the scrap Mission 15b : back in the scrap Mission 16 : thirsty Mission 17 : ever more thirsty Mission 18 : hope Mission 19 : to the jungle - 2nd try Mission 20 : into the green Mission 21 : sculptures Mission 22a : dazed Mission 22b : confused Mission 23a : steele Mission 23b : steele Mission 24 : the capture Mission 25 : to the alien site Mission 26 : further on Mission 27 : chainsaw Mission 28 : vaccine Mission 29 : getting closer Mission 30 : the end