The so-called stages in which the players on a server gain the trust of the native Resistance Movement are per server, while the Caravan Certificates are per person, something like your alliance with the Ketra Orcs/Varka Silenos.

The NE/EU servers have already gone through all the stages and Hellbound is completely opened up.

These stages are basically consisting of You starting off by doing small services for them (procuring travel permits etc.), gain their trust and they give you increasingly more challenging tasks to do.

All the players of one server are contributing to these stages. The trust points they individually gather are added up and anybody killing natives can "delevel" the server.

Like for example if the stage of the server progress is not high enough players will be faced with the invisible barrier in front of the Battered Lands, for exemple, the level of trust on the PTS had not yet reached level 7, so the Chimera quest was not available.

Here is what you have to do at the different stages:
Stage 1: Killing monsters in the harbor area
Stage 2: Relieving the lost souls at the Ancient Temple Remnants from their suffering
Stage 3: Defending the native village southwest of the Hidden Oasis
Stage 4: Relieving Derek at the Ancient Temple Remnants from his suffering
Stage 5: Liberating Quarry slaves
Stage 6: Battle at the Enchanted Megaliths
Stage 7: Fighting the monsters in the Battered Lands
Stage 8: Breaking through the Enceinte (badly translated as "Iron Castle" instead of "Iron Wall")
Stage 9: Rescuing the slaves at the Oasis south of the Enceinte gate
Stage 10: Taking possession of the [Base Tower] of the Steel Citadel
Stage 11: Fighting the Bosses in the [Tower of Infinitum], [Tully's Workshop] and the [Tower of Naia]