Ice9sMom won the Should Auld Acquaintance... achievement in BioShock Infinite

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So many Bears
Achievement won on 23 Mar 13
TA Score for this game: 2,505
Posted on 23 March 13 at 18:37This solution has 26 positive votes and 4 negative votes. Please log in to vote. Maka91
Achievement won on 26 Mar 13
TA Score for this game: 1,281
Posted on 26 March 13 at 06:00This solution has 14 positive votes and 6 negative votes. Please log in to vote. Enter the following code at the main menu of the game:
Up, Up, Down, Down, Left, Right, Left, Right, B, A

Alternatively, you can complete the main game to unlock it.

X1ooobirds
Achievement won on 26 Mar 13
TA Score for this game: 2,505
Posted on 26 March 13 at 06:16, Edited on 30 March 13 at 16:44 This solution has 9 positive votes and 7 negative votes. Please log in to vote. This achievement is earned by unlocking 1999 Mode through 1 of 2 methods.

1. You can choose to complete the game on a first play-through on either Easy, Normal, or Hard difficulty.

2. You can input the old school Konami "cheat" code to unlock the mode and play through it right off the bat, if you choose. The following code can be entered from the Main Menu, Up, Up, Down, Down, Left, Right, Left, Right, B, A.

If either method is performed you'll pop this 10G achievement!

DAMAGEvs
Achievement won on 27 Mar 13
TA Score for this game: 1,721
Posted on 27 March 13 at 20:34This solution has 3 positive votes and 2 negative votes. Please log in to vote. To unlock 1999 mode type in the infamous Konami Code at the beginning of the game (Up, Up, Down, Down, Left, Right, Left Right, B, A).

Pressing A will unlock 1999 mode and you will begin.

Some quick tips:
- 1999 mode can be unlocked from the start
- When you die, it costs ~75-100 silver eagles as your 'respawn toll'
- If you die and don't have enough silver eagles to cover the respawn toll, you are booted to the main menu and will continue at the beginning of the section you were currently on.
- Tougher enemies with improved accuracy and more health.
- Harder resource management.
- Unable to change difficulty.
- Unable to access the map (up arrow).