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