First you need to keep at default settings which is set in the main menu under options. Do not alter the number of starting lives or the difficulty.
Each level consists of four games (Battle Tanks, I/O Tower (Grid Bugs), Light Cycles and
MCP Cone) which need to be completed to advance to the next level. To get Fortran you need to reach level 4. You do not need to complete level 4, the achievement will unlock once you start level 4. Each of the levels have a set pattern. Below I have posted videos of how I complete each of the 4 challenges on Level 1 (RPG), Level 2 (COBOL) and Level 3 (BASIC)
Link to full playlist:
https://www.youtube.com/playlist?list=PLsa6Wwl3yBRyDrcBuEBak...Video WalkthroughLevel 1 - RPG - Battle TanksLevel 1 - RPG - IO Tower (Grid Bugs)Level 1 - RPG - Light CyclesLevel 1 - RPG - MCP ConeLevel 2 - COBOL - Battle TanksLevel 2 - COBOL - IO Tower (Grid Bugs)Level 2 - COBOL - Light CyclesLevel 2 - COBOL - MCP ConeLevel 3 - BASIC - Battle TanksLevel 3 - BASIC - IO Tower (Grid Bugs)Level 3 - BASIC - Light CyclesLevel 3 - BASIC - MCP Cone