Welcome to my guide for Viva La Resistance. I have just unlocked this achievement, but did some quests 2 months ago, and finished the remainder the last 24 hours. So I hope to have the correct quests listed here. If there are any adjustments to be made, leave a comment and I will correct the guide.
First off, you will reach the Helsing Lair via the DreamWorks as you progress the story, so reaching it cannot be missed.
Quests in my Journal that relate to this achievement:
The Swamp Lilies: Collect 8 Swamp Lilies. Simple enough, as there are only 8 to collect. This quest is for Saffi in the lair. You need to head to Industrial Port (Pier 13) to find them. They are located near water sources, and are of a green/yellow colour. So they stand out, and you would be hard pressed not to see them.
Hidden Treasure: You will have a quest to rescue Todor Schimko during the quest The Assistant to acquire Generator Plan. Once he returns to the hideout, buy the Treasure Map from him. It will cost a lot of Gold, but for the achievement, you will need to do this. As with the above quest, its the same map. It's a plain looking crate, and will appear on your mini map with a pulsing circle marker.
Enemy in the Tunnels: The Engineer will provide this quest in the lair. It's simple enough, and you just need to clear the walkways beyond the previously closed gates in the lair. Just kill anything that moves.
Start the Generator: The Engineer will give you this quest. You will need to collect 4 Electric Coils from the Dreadworks area and return to the lair. There will be markers on your map when you have this quest. Once done return to the engineer to complete the quest.
The Gas Projector: Destroy the Gas Projector. You get this from Count Vlados in the lair. It may be a main quest, but I'll include it in the solution to be on the safe side.
The Ritual: This is also given by Saffi, who gave you the Swamp Lilies quest, but I unlocked the achievement, despite only having found 3/5 Rat Bones. If it is supposed to be part of the achievement requirements, then its glitched in a good way.
Again, hope this is all correct, and if you spot any mistakes, let me know, and I will ammend the guide with credit for yourself.