BioShock Infinite

Whilst missable in theory, this achievement should be easy to unlock.

Early in the story, you acquire the Skyhook. As well as allowing you to ride the sky rails, it serves as your melee weapon. Hitting Y gives you the basic melee attack.

This achievement is not for melee kills but for executions. You execute an enemy by holding Y when you see a skull icon above an enemy. Some unarmoured enemies will have this straightaway. You will know when you have performed an execution as you will get a short cinematic showing you gutting or beheading the unfortunate individual on the wrong end of your skyhook.

More heavily-armoured enemies will need to be damaged before the skull icon appears. A basic melee attack closely followed by an execution works well with the lightly-armoured enemies.

If you're patient enough, you can grind this early on. Reloading a checkpoint does not affect your cumulative total (for this or other "do something a certain number of times" achievements - you can use this to your advantage to get a few kills shortly after a checkpoint then simply reload the checkpoint. Rinse and repeat until you get to 20 kills.

For reference, it unlocked for me (withoyut grinding it) shortly after rescuing Elizabeth and reaching the point where she picks her first lock.

Bioshock Infinite - Industrial Accident - Farming Method

This achievement is very easy. And can be done very soon after being given the Melee Sky-Hook. Now the correct method for using it and what counts towards the achievement

Pressing Y just does a normal melee but pressing and HOLDING Y very near a week enemy (first enemies you see are perfect) and watching small cinematic sequence where you will destroy him to death. Do this 20x and achievement is yours.

Watch the video below for a detailed descrition on how to farm and where I did it

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