If you are web development then you must know following.
Front End Developer
1. HTML5, CSS3, JavaScript, Jquery
2. JS Framework- angular
3. UI library- Semantic UI, Bootstrap, Foundation, Polymer
4. Front End Tools - Gulp, Grunt, Bower
5. CSS preprocessor - LESS, SAAS, Stylus
6. JS preprocessor - CoffeeScript, TypeScript, LiveScript
7. Asynchronous - Ajax
Back End Developer
1. PHP, Python, Ruby
2. Backend Framework -
PHP - Symfony, Laravel, Nette, Zend, CodeIgniter
Ruby - Ruby On Rail
Python - django
JavaScript - Node.js, Express.js, Total.js, Sails.js, Meteor.js
3. Database - MySQL, MongoDB, PostgressSQL, MariaDB
Code Quality
1. TypeSystems - FlowTyped, TypeScript
2. Testing - Mocha, qunit
3. Quality - jslint
Summary
This is latest list for development but you can also need to learn ASP.NET, Java, MS SQL Server etc
