BioShock 2

story-based achievement - kill all the splicers in the train station area and as you progress through the achievement will unlock. doesnt get much easier than that :)

You won't have time to set trap rivets very strategically in the train station itself, so I recommend first setting up some in the ticket room before you talk to Tenenbaum. After dispatching the splicer banging at the ticket window, set trap rivets at about head height (for a headshot kill ;), it actually works!) around the two gates and when the gates open the splicers will be running into a trapfest. ;)

The splicers themselves will be streaming in from a couple of raised doorways in the station (think splicer vents ;p) and may even stay there to throw some cover fire and fire bombs your way. You will run out of rivets eventually, so once you get out there, aim for those vents, one immediately to the left and the other further down on the right. The left one will most likely be the one most "populated" when you go out.

Pick them off and you'll see this achievement pop with a thank you from Tenenbaum and directions on how to proceed with... Sinclair.

Good luck!

This is a story related achievement and will unlock with natural progression. Finish the 2nd level and this one will unlock.

Just be aware you will have a difficult battle (especially if you're playing on hard) against loads of splicers at the end of the level.

I was playing on hard so I waited for them on top of the stairs (before you flip the switch and look at the woman with the little sisters on the other side of the glass), once you've done that go back stay on top of the stairs and setup traps using the Rivet Gun on the stairs, try to same some ammo before the battle (very difficult on hard as you'll never have a lot of ammo). There is a security camera on the left-hand side (outside - next to the trains) that you can try to hack (I couldn't as I was playing on hard and was worried about killing and not being hit by the splicers).

Unmissable storyline achievement. Happens at the end of the first full level. Follow the arrow and look for glowing objects when you're lost. You can press "M" at any time for help.

For the fight itself, the enemies will come through the gate in front of you. Lay down trap rivets and remote hack the camera. It's an easy fight even if you don't.