Beating the End:
Go into the survival viewer, then the map. Enter the code
Up,Up,Down,Down,Left,Right,Left,Right,Square,Triangle. The End's position will show up as a red dot.
Infinity Face Paint:
Capture the Tsuchinoko snake alive till the end of the game.
Capturing the Tsuchinoko:
Go to Sokrovenno North. Use the sonar to find a dot with no animal on it. Lay mousetraps in this area, then leave and return. You should have captured the Tsuchinoko. You will have to capture it again at the waterfall after meeting Eva. However, this time it is visible.