You don't need to learn EVERY language , just learn every language which can do what others cant (like one for software dev. and one for web dev. or whatever you want to)
Here are the language I am going to learn
c++ - in progress
C#- in progress because itwill remain mainstream for windows dev.
Python - because python was my first love which I lost
oh and django <3
Php- for web
javascript - obvious reasons know jquery already
ruby - because rubyonrails , nuff said
Objective C - because I can create apps with it and loot the apple rich fan boys
Yes this app will be for ONLY 999$
SQL-query language , obvious reasons
JAVA- because android .
EDIT: In the end I will learn assembly