Here is the full list of all 58 Paladins achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Have over 30 different champions at mastery level 20 or higher
Have over 30 different champions at mastery level 15 or higher
Play 250 hours with a player from your friends list in your party.
Play 100 hours with a player from your friends list in your party.
Have over 30 different champions at mastery level 10 or higher
Earn over 1,000,000 Gold over your play history
Play over 300 matches
Reach Master in Ranked
Reach a 20 kill streak in a match
Earn over 500,000 Gold over your play history
Get a daily reward 7 days in a row
Spend over 100,000 Credits in the item store over all your matches
Have a Paladins account over 1 year old
Heal over 100,000 health in a match
Build your own custom loadout
Shield over 200,000 damage in a match
Unlock Ranked
Play 25 hours with a player from your friends list in your party.
400 Double Kills.
Be the only player alive in a match.
Kill an enemy player who is on a 15 killstreak or higher.
Kill an enemy player from over 300 units away.
Kill a player in the air who is over 100 units above the ground.
Die to an environmental hazard.
Deal more than 100,000 damage during a match.
Unlock 100 Cards.
Kill an enemy player while you are at or below 50 Health.
Kill a player with an environmental hazard.
Get a killing blow after the round has ended.
Play 100 matches while in a party.
Reach level 30 during the Paladins Beta.
200 Double Kills.
Play 10 hours with a player from your friends list in your party.
Play 50 matches while in a party.
Play 5 hours with a player from your friends list in your party.
Complete the Paladins Tutorial.
Play 20 matches while in a party.
100 Double Kills
10 Champions at Mastery 5.
9 Champions at Mastery 5.
8 Champions at Mastery 5.
7 Champions at Mastery 5.
6 Champions at Mastery 5.
5 Champions at Mastery 5.
4 Champions at Mastery 5.
Land 5 headshots in a row without missing.
3 Champions at Mastery 5.
Deal damage to every enemy champion in a match before any of them damage you.
50 Double Kills.
Play 10 matches while in a party.
2 Champions at Mastery 5.
Kill an enemy champion after they had already killed you.
Kill more than 20 enemy champions in a single match.
10 Double Kills.
Play a match while in a party.
1 Champion at Mastery 5.
Survive more than 50 battles with less than 10% health.
Win a match where the enemy team scored no points.