Crash Bandicoot N. Sane Trilogy

IMPORTANT NOTE: I WOULD HIGHLY RECOMMEND GOING FOR RELICS AFTER YOU HAVE COMPLETED THE GAME AS FINISHING THE GAME REWARDS YOU WITH SPEED BOOTS (making this much easier, most levels are near impossible to even get a sapphire relic without them). ALSO, AS THERE ARE MANY OTHER RELIC RELATED ACHIEVEMENTS (MOST REQUIRING YOU TO GET GOLD OR HIGHER) I STRONGLY RECOMMEND MAKING SURE YOU GET AT LEAST A GOLD FOR A LEVEL BEFORE MOVING ON.

This achievement is pretty self-explanatory, you simply have to earn 5 relics. Relics are earned through completing a time trial for a level. Time trial mode is activated by picking up the stopwatch at the start of the level. In order for this stopwatch to appear in the level, the level has to first be completed and crystal collected. In summary:
Step 1: Complete a level and collect the crystal for it.
Step 2: Press LB (left bumper) in the warp room next to the corresponding level to bring up the times needed to obtain each colour of relic (platinum, gold and sapphire). As the achievement states 'earn 5 relics' you can simply aim for the sapphire relics (slowest time). (Although I recommend as there are many other relic related achievements that you try and get at least a gold relic for each level).
Step 3: Enter the level and pick up the stopwatch
Step 4: Complete the level as fast as you can (grabbing as many timeboxes as you can get, they slow time for however many seconds the number on the box indicates) and at the end of the level if you make it under the sapphire time you will get a relic.
Step 5: Repeat steps 1-4 for 4 more levels.

Do all this and the achievement is yours!