Apex Legends

Important: This trophy can potentially glitch and not unlock despite being or over Player Level 50+.

I haven't found an official response yet to the issue, but if you have this glitch happen to you, you're just screwed until a patch resolves it. It does seem to happen to people who disconnect from the game when they're Level 49 and about to hit Level 50. Since they missed seeing or hitting the level 50, they've missed the chance of unlocking the trophy and therefore get glitched and there's nothing you can do to fix it. Also, I don't recommend accepting any invites from friends or squad members if you're about to hit Level 50. You might miss the widow of viewing the results screen where your trophy would have unlocked.

If you leave the game and your squad are still alive while you're dead permanently, you won't get any XP from that match. If you stayed until they all died or win the game, you will get the XP.

For this trophy, you'll need to reach player level 50. Leveling up in Apex Legends allows you to earn Apex Packs for cosmetic items and Legend Tokens. At Level 25+, each level requirement becomes a flat 18,000 XP needed to reach the next level and will remain the same as you continue playing the game. The level cap in Apex Legends is player level 100. After 100, you will always get Legend Tokens as rewards which can be used to purchase other Legend heroes that get released without spending real money.

Other than that, the best way to earn Experience Points (XP) opposed from getting eliminations, surviving a very long time or winning the game are the following categories:

Teamwork and Survival: The game is meant to be played with friends and not randoms. You will get more XP per game by playing with friends and cooperating with each other or assembling your squad. Not only that, but if you do manage to survive a very long time or win the game. The XP amount will always be the highest amount due to the XP bonuses you receive.

The bonuses are the following things:
 

1. +180 XP per minute survived
2. +25 XP per Ally Revived
3. +200 XP per Ally Respawned
4. +5% Bonus to Survival Time while in a Party (per friend)
5. +500 XP if your Squad is with the Champion

Victory, Performance and Placements: Winning the game will net you the most XP possible in addition if you were with friends or squad up. Winning games in the top #1-3/20 Squad Placements will be about +300/+500/+900 XP. The +900 coming from the Won Match Bonus XP while +500 is 2nd place and +300 is third place. Anyone at #4-20/20 Squad Placements don't receive the Top 3 Finishes XP. That is why victory and performance is key to getting the highest XP per a match. On average, if you're with friends or a squad and you Top 3 Finish, you will get about 4500 to 7500 depending on how well you've performed.

Kills and Eliminations: Battle Royale is all about killing and of course you can gain even more XP from getting those secured eliminations.

Below is a listing of things that can help you get more XP from kills:
 

1. +500 XP for the first kill of the day. You only get this XP once a day and is unaffected by bonus XP.
2. +50 XP per secured eliminations. It should be noted that knockdowns aren't kills. However, if an enemy or squad member finishes off an enemy you knocked down, then it'll count as your kill.
3. +500 XP if you managed to eliminate the current Kill Champion. Do note that if your team is the kill Champion, then obviously you won't be getting this bonus.
4. +50 XP per an elimination if you're the current Kill Leader. If you're the current Kill Leader of the match, the more kills you can get means the more XP you'll receive. Think of it as double XP per a kill since eliminations are always worth +50 XP. Kill Leaders will be getting essentially +100 XP per a kill they secure as long as they remain the Kill Leader (person with the highest kills).
5. Damage Done XP is the total damage you dealt during the match. The number is divided by 4 and then you get that as XP. For example, 1000 damage is worth +250 XP Earned.