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