Mass Effect 2
62 Achievements
1,355
55-70h
Explorer
Visit 100% of the planets in an unexplored cluster
10
How to unlock the Explorer achievement in Mass Effect 2 - Definitive Guide
Start with the Ma-At section of the cluster and you only need to probe the one and only planet there.
Then, after that, probe the other 2 planets to get items (you need to actually scan the planets to get some resources). You'll have 100% before no time.
SPOILER
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It takes place after you defend the human colony from the collectors that Ash is on..
Good luck!
This sounds complicated and drawn out but it shouldn’t take too long. You can do this at any point when you have control of the Normandy. Enter any of the system clusters using the Relay station, once you enter a cluster you can go to the edge of your current cluster and explore the rest of the system. You will notice a percentage next to the names of each cluster. Make sure you have enough fuel and make your way to each cluster.
Once you enter an unexplored cluster fly around the planets and enter their orbit by pressing . Back out and repeat this for each planet within each cluster. Once you have visited all the planets within a single system the achievement will unlock.
The clusters are what you travel to on the galactic map. Next to each cluster name is a percentage. That percentage is the number of planets that you've explored. Each cluster is made up of multiple systems. You have to visit every planet in each system. Once you have control of the Normandy, guide it towards each planet in the system and push and then to leave orbit. Leave the planet and head to the next one. As long as the planet has a name, it'll be registered as explored. Travel to the edge of the system with the Mass Relay to explore the other systems in the cluster. Make sure that you stop off at the Fuel Depot before leaving the system. Repeat the process that system and any other system in the cluster.
This sounds complicated and drawn out but shouldn’t take too long. You can do this at any point when you have control of the Normandy. Enter any of the system clusters using the Relay station, once you enter a cluster you can go to the edge of your current cluster and explore the rest of the system. You will notice a percentage next to the names of each cluster. Make sure you have enough fuel and make your way to each cluster.
Once you enter an unexplored cluster fly around the planets and enter their orbit by pressing . Back out and repeat this for each planet within each cluster. Once you have visited all the planets within a single system the achievement will unlock.